Trial field key to the species of

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Trial field key to the species of AGARICUS in the Pacific Northwest

Prepared for the Pacific Northwest Key Council

by Laverne R. Chariton (North Idaho Mycological Association)

January 1992, Revised June 1997

Copyright  1992, 1997, 2003 Pacific Northwest Key Council

Reformatted by Ian Gibson April 2003


Introduction 1

Acknowledgements 2

Sections 3

Section A: Group 100 - Unchanging species 3

Section B: Group 200 - Red stainers species 5

Section C: Group 300 - Yellow stainers species 7

References 13

Glossary 14

Index 15


The genus Agaricus, referred to in older publications as Psalliota, is made up of a group of mostly medium sized to large saprophytic (living on dead organic matter) mushrooms, with variations in color of the pileus from white to almost black or sometimes shades of yellow, pink, brown, red to violet. The cap surfaces have appressed hyphae, radially arranged, and under varying conditions may appear glabrous, fibrillose, squamous, or areolate. They have chocolate-brown to purple brown spores, gills that are free from the stem, close, pallid to pinkish when young then colored by the spores to chocolate-brown to blackish brown at maturity. The stem is central, separates easily from the cap, and is fleshy, except in the Minores (the little guys, whose stems are thin and sometimes fragile). Flesh color is pure white or whitish unless otherwise noted. The stem may be solid, stuffed or hollow. An Agaricus will always have a ring on the stem. If evanescent, there will still be evidence that a ring had been there, such as a zone on the stipe or fragments clinging to the pileus edge. If the ring is thin, silky or cottony, it may be termed "single", meaning there would be no veil patches on the underside. When the ring is composed of two clearly visible layers of tissue , it is called "double". In some cases the under layer will have separated into colored patches on the underside of the upper layer. These rings may be skirt-like (pendant), intermediate (sub-peronate), or sheath-like (peronate).
In species identification the spore size is significant also. A microscope will give that answer.
Staining reactions should especially be noted in fresh specimens by cutting or rubbing the flesh of the cap and stalk, and in the extreme base of the stem. Some species are unchanging with rubbing or cutting. Others are rufescent (red to orange or vinaceous). Many are lutescent (yellow, yellow-orange or ochraceous) when bruised or cut, although some take as long as 15-30 minutes to stain. If chemicals are used to check the staining reaction, be sure to discard that tissue so it will not be ingested.
Odor should be noted in fresh specimens by cutting or crushing a portion of the cap tissue and the base of the stipe. Those species that emit an unpleasant odor (phenol, creosote, ink or bleach) seem to poison the majority of people who eat them. Usually there is a correlation between the intensity of lutescence and the strength of the odor. The brighter the yellow stain the stronger it smells. Any of the species that smell bad are likely to produce vomiting and diarrhea, the worst culprit being A. xanthoderma, called "the sickener". This unpleasant odor becomes more pronounced on cooking. The pleasant smelling Agaricus will be sweet, like anise or almond extract, sometimes mild, at times almost absent.
Many species grow in grassy areas, others will fruit near trees or in woodlands. Many species look very similar to others, and many are variable in size, shape and color.
The species listed in this trial key are those on record as having been collected in Washington, Oregon, North Idaho and Northern California.


In the spring of the year 1968 a friend, Elsie Coulter, who lived in Hayden Lake, called me and said "I ate my first morel today". My response to that was "What is a morel?" Elsie and I and others were lucky enough to be among the charter members of the North Idaho Mycological Association that year.
We have learned a lot since then, and have had an interesting hobby and a very rewarding way of life. Perhaps this project will in some small way give back to others help such as I received along the way from those more knowledgeable than I.
I owe unlimited gratitude to our teacher, mentor and friend, Kit Scates Barnhart. I also wish to thank Harley Barnhart for lending me his European publication written by A. Cappelli, which had the excellent color plates of so many Agaricus species. I am grateful also for being able to use the printed material of William (Bill) Isaacs, Richard Kerrigan, David Arora and others.
I also wish to include the fellow members of the Pacific Northwest Key Council who have encourage me and make helpful suggestions along the way.
A. Flesh or surface not changing on cutting or bruising (allow 15-30 minutes); and surface not changing with age 100

B. Flesh or surface changing to red or red-brown 200

C. Flesh or surface changing to yellow or ochraceous when cut or bruised, or with age 300
101a Cap large, 10-25 (35) cm. A. crocodilinus v. crocodilinus

CAP dry; white or tinged "cinnamon-buff" over disc; surface sometimes cracking, causing it to resemble the skin of a crocodile, usually on exposure to sun; flesh firm, thick, unchanging. ODOR mildly almond. GILLS broad, ventricose, crowded, not pink at any time, pale when young, dark purple-brown at maturity. STEM 10-15 cm long, 2-4 cm thick; easily obliterated scales below ring; white, red-brown with age. RING double, membranous; white. HABITAT always in the open. EDIBLE.

101b Cap smaller, less than 10 cm (mature specimens) 102


02a Stem with double ring 103


02b Stem with single ring 105

103a Stem equal, short, stout and smooth (see 204a) A. bitorquis


5-25 cm; margin inrolled; white to gray or buff; kidskin smooth; flesh dry, firm, unchanging or slightly reddening after cutting, sometimes tough. ODOR not pronounced. TASTE mild. GILLS close, pallid at first, grayish-lavender then dark-blackish brown. STEM 4-18 cm x 1.2-3.8 cm; firm and solid, surface white; flesh of stem slowly, finally rufescent. RING two rings on stem, the upper edge free or flaring, the lower flaring upward. HABITAT urban, on hard packed ground, along roadsides, even pushing up asphalt. EDIBLE and good.

103b Stem bulbous, with or without scales 104

104a Stem clavate or with slight bulb, smooth A. integer nom. prov.


8-15.5 cm broad; white at first then buff to light ochraceous, then pinkish gray. ODOR slightly unpleasant almond. GILLS white in button then grayish-pink. STEM 9-11 cm x 3 cm; smooth, white. RING double, cogwheel. HABITAT open grassy places, sometimes in moss. EDIBLE.

104b Stem bulbous at base with pointed scales in rings A. nivescens v. nivescens


7-12 (25) cm; shiny white then tan, bruises ochraceous; dry, silky smooth; flesh white, unchanging, thick, firm. ODOR almond. GILLS white, then pale gray to brownish-lilac, then chocolate-brown. STEM 8-9 cm x 1.5-2.5 cm; stipe as long as the width of the cap; solid; white. RING double, thick, flaring; triangular felty patches on the underside; white. CHEMICAL yellows with KOH (see 311a). HABITAT pastures, in grassy places; fall. MICROSTRUCTURES spores 5.9-7 x 4.7-5.3 um. REMARKS If ochraceous bruising is noted, this should key to 311a (A. osecanus may be the same species.) A parkensis has broadly umbonate lustrous silvery cap with brownish disc, grows near trees (Robinia, Quercus), and could key here if cap not much changed with age (see 312b).
105a (102b) Cap white. Gills bright pink in button A. campestris


sometimes at maturity a dingy tan, disc brown. ODOR mild almond. GILLS pink at first, finally blackish-brown. STEM 3-11 cm x 0.5-1 cm thick; tapering to a point at base; white. RING single, evanescent, white. CHEMICAL not yellowing with KOH. HABITAT always in open areas; spring & fall East of the Cascades. EDIBLE and choice.

105b Cap with colored fibrils (wine-brown, gray-vinaceous, cinnamon-buff, or with orange pigment). Gills usually pale pink, gray or white in button 106

106a Cap medium, fibrils purple-brown to wine-brown. Stipe with white wooly substance below ring (see 203a) A. subrutilescens


7-13(20) cm; dry, white with large brown scales, becoming more reddish-brown (purple-brown) on whitish ground. ODOR fruity/spicy. GILLS at first pallid, then pink, then blackish-brown. STEM 8-17 cm long, 2-3 cm thick; equal to clavate; white, except apex initially pink, base aging brownish. RING subapical, rarely median; pendant, thin; white. CHEMICAL turns green slowly with KOH on pileus; not reddening, not yellowing, gills only rufescent. HABITAT sylvan, conifers or mixed hardwoods. EDIBLE delicious, but has been known to cause severe gastric upsets in some people.
106b Cap medium or small, fibrils gray-vinaceous, cinnamon-buff, or with orangish pigment. Stipe white or flushed brownish 107
107a Cap medium; fibrils with orangish pigment (see 316a) A. smithii


8-13 cm; dry; yellowing with age. ODOR almond-like. GILLS close; dull pinkish, then grayish, finally blackish-brown. STEM 7-15 cm x 1-1.5 cm above, 2-4 cm at abruptly bulbous base; white-yellowish at base; stuffed-hollow with age; deciduous fibrils over lower stipe; base with yellowish mycelial strands. RING subapical to supramedian; ample; pendant; white; cogwheel with tawny points. SPORES dark brown; ellipsoid. HABITAT, DISTRIBUTION mixed conifers; October to November (January); CA to OR.
107b Cap small, fibrils gray-vinaceous or cinnamon-buff. Stipe white or flushed brownish 108
108a Cap with gray vinaceous fibrils. Stipe white, floccose above and below ring. A. lamellodistans nom. prov.

CAP 3-6.5 cm; dry; scaly; flesh unchanging. ODOR odorless. GILLS white at first becoming rosy-pink, finally dark vinaceous-brown. Deeply rounded at stipe, abruptly pointed at cap margin. STEM 2.5-4 cm x 2-2.5 cm thick at apex; equal or tapering to a point at base; white, then rosy-pink, finally light brown. RING median; appressed to stipe as a broad band. HABITAT in grass under pine.
108b Cap with cinnamon buff fibrils, stipe smooth, flushed vinaceous-fawn to brown at base A. subsolidipes nom. prov.


6-8 cm broad; fibrillose, creamy ground with darker scales; flesh unchanging. ODOR faint but disagreeable. GILLS pallid, then pink, finally chocolate-brown. STEM 5-7 cm x 1.8-2.3 cm; base narrowed, white, unchanging. RING superior; thin, narrow; occasionally with double edge; white. HABITAT on lawns.

201a Flesh changing quickly to red or red-brown when bruised or cut 202

201b Flesh changing slowly finally to red 203

202a Cap white, then flushed dingy gray, smooth A. benesii


2.5-8 cm broad; dry; margin floccose-tomentose; disc maroon; flesh stains on pileus and flesh of stipe. ODOR fruity/spicy. GILLS pale to gray-flesh in button, darkening to reddish-brown. STEM 4.5-13 cm x 1-1.5 cm; bulbous or slightly clavate; going quickly red in the upper 1/3 when cut; surface silky above ring, numerous white squamules below; basal region buff to pinky-cinnamon. RING pendant, flaring; white. HABITAT conifers and/or pine. EDIBLE.

202b Cap with red-brown overlapping scales A. haemorrhoidarius


large, up to 12 cm broad; appears smooth at first, breaking into scales on nearly white ground; flesh thick, firm, stains quickly cherry-red when cut. ODOR faint. GILLS white, then flesh-pink, or gray-pink. STEM 7-13 cm x 1-2 cm; equal, with narrow flattened bulb; floccose-squamose on lower half. RING pendant, persistent. HABITAT under conifers. EDIBLE and good.

203a (201b) Stem white, densely wooly below ring (see 106 a) A. subrutilescens

203b Stem dingy brown, smooth or possibly with fibrils 204
204a Stem with two rings, sheathing from below upward (see 103a) A. bitorquis

(formerly A. rodmani)

204b Stem with one ring, thick or thin on edge 205

205a Stature tall and slender A. annae


small, usually under 6 cm; surface appressed fibrillose; stains slowly red. ODOR none. STEM 7-9 cm x 1-1.5 cm; stains orange-red when cut. RING single; brown. HABITAT usually with cypress. (Has been found in the Hayden Lake, Idaho area under mixed conifers. Rare.)

205b Stature blocky, length of stem equal to cap width 206

206a Stem equal, smooth streaked brown A. bisporus


4-16 cm; with broad red-brown to cinnamon-brown scales. ODOR fruity spicy. GILLS pink when young, blackish brown at maturity. STEM Lighter zone above ring. RING narrow; felty; single; undersurface with wide toothed flaps that separate from the surface and point down the stem; white. HABITAT cultivated, or manure rich ground. (The wild brown variety has been collected in Post Falls and Rathdrum in Kootenai County, Idaho.) EDIBLE.
206b Stem bulbous or club-shaped, white to dingy brown 207
207a Stem smooth, bulbous A. silvaticus


5-10 cm; dry; smooth; nut-brown (tawny olive/fawn); scales on lighter ground; flesh firm, thick, turns red-brown when cut, especially outer layer at stem top and just above the gills. GILLS whitish, then pale pink, then dark chocolate-brown. STEM 6-10 cm x 2-2.5 cm; white, tinged pinkish or dingy brown with age. RING sheathing striate above; white squamules under, turning gray finally. CHEMICAL not yellowing with KOH. HABITAT mixed conifer woods.
207b Stem with fibrils, clavate 208
208a Stem somewhat clavate, white, densely fibrillose below ring A. flavitingens


4-10 cm; dry with sordid yellow-brown fibrils; flesh stains vinaceous-pink when cut or bruised. ODOR none. TASTE nutty. GILLS pink, then dark sordid purple brown. STEM silky above the ring. RING single, thin; pallid. HABITAT with Western Red Cedar, Douglas Fir, maple and alder.

208b Stem massively clavate, with light brown fibrils in zones A. lilaceps


7-25 cm; dry; smooth with pale brown to cinnamon brown fibrils. ODOR fruity/spicy. GILLS pallid, then pale pink, then becoming reddish-brown or purple brown. STEM 5-22 cm x 3-6(9) cm; not truly scaly. RING superior; skirt-like pendant; under-surface white or yellow. CHEMICAL cuticular hyphae bright yellow with KOH. HABITAT with cypress or other trees. EDIBLE and choice.

REMARKS Not as broad as A. crocodilinus, not as a tall as A. augustus, but much denser.
301a Odor unpleasant (phenolic, creosote, ink or bleach) 302

301b Odor and/or taste of almonds or anise, sometimes mild or none 307

302a Cap smooth, white when young, cracking with age. Quickly staining bright yellow on all parts A. xanthoderma


5-15 cm; darkens to brown; flesh spongy. ODOR strong, unpleasant, phenolic. TASTE unpleasant, phenolic. GILLS pale at first, then deep brown. STEM 5-12 cm x 1-2.5 cm; chrome yellow at base when cut; subbulbous. RING pendant with cottony underside, thick, flaring. CHEMICAL bright yellow with KOH. HABITAT lawns, at edges of paths, in gardens, at edges of woods; August to December. POISONOUS (Can cause sweating, nausea, and severe stomach cramps.)
302b Cap with colored fibrils. Stem yellows only at top or base 303
303a Cap with honey-brown, red-brown, or cinnamon-brown fibrils. Stem top staining yellow when cut A. helodes nom. prov.


4-12 cm broad; dry. ODOR unpleasant, phenolic. TASTE mild almond. GILLS pallid, then wine-pink. STEM 7-15 cm x 0.5 to 1-1.5 cm; surface silken-shining at apex; lower surface with scattered loose fibrils of shining white. RING superior; flaring; upper surface striate, undersurface cottony; not truly double. CHEMICAL bright yellow with 3% KOH. HABITAT conifers, needle duff.
303b Cap with fawn-brown or silver-gray fibrils. Stem base yellowing when cut 304
304a Cap with fawn-brown fibrils on pale to buff ground A. hondensis


4-15 cm; with fawn-brown fibrils on pale to buff ground; smooth at first. ODOR creosote or phenol; unpleasant. TASTE metallic. GILLS white in buttons, then pinkish, finally lilac-gray to reddish-brown or chocolate-brown. STEM 6-15 cm x 0.5-2.5 cm; smooth, without scales; equal or slightly bulbous to massively bulbous (up to 4 cm thick). RING thick, felt-like, flaring. CHEMICAL bright yellow with 3% KOH. HABITAT low elevation, conifer duff. POISONOUS.

REMARKS A handsome forest mushroom but can cause serious gastro-intestinal distress. It is a lookalike to A. haemorrhoidarius, the edible one with reddening flesh and pleasant odor.
304b Cap with silver-gray to gray brown fibrils 305
305a Cap with silver-gray to gray-brown fibrils on lighter ground A. praeclaresquamosus


. meleagris
is a synonym.)
CAP 5-20 cm; with silver-gray to gray-brown fibrils on lighter ground; flesh bruising bright yellow in base of stem, pinkish with age. ODOR unpleasant, phenolic, ink-like, (especially when cooked). GILLS pale gray to pink, then chocolate-brown. STEM 7-18 cm x 1-3 cm; equal to clavate; smooth; white to reddish-brown. RING thick, felt-like, flabby; cogwheel; white. CHEMICAL cap surface yellowing with KOH. HABITAT conifer forest edges or lawns; September to December. POISONOUS.
305b Cap with inrolled margin, yellowing or with bicolor flesh 306
306a Cap white with gray-brown fibrils. Gills pallid in button stage A. californicus


3-9(12) cm; at first marshmallow shaped expanding to broadly convex, plane or broadly umbonate; dry, smooth, white to silvery-gray with gray-brown center then red-brown; flesh thick, white, unchanging or yellowing slightly when bruised. ODOR faintly phenolic. GILLS pinkish-brown after veil breaks; chocolate-brown at maturity. STEM 3-8(12) cm x 0.5-1(1.5) cm; equal; smooth; white; often crooked. RING persistent; superior or median; skirtlike. HABITAT found in lawns, gardens and woods; year round in California. Mildly POISONOUS.

306b Cap with cinnamon-brown fibrils. Gills grayish A. crassistipus

CAP 9-20 cm; margin abruptly inrolled; dry; rich, dark cinnamon brown squamules against flesh colored ground; darker on disc; pileal surface turning yellow slowly when bruised. ODOR phenolic. GILLS pale grayish to gray-vinaceous then dark reddish-brown. STEM smooth and silken above annulus; two band-like zones of concentric scales below; white, soon flushed grayish flesh color, where bruised becoming yellow then rufescent, the yellow mostly in the upper portion of the stipe, the rufescence in the stipe base and the cap. RING median to inferior, thick, recumbent, smooth, striate, white. HABIT, HABITAT gregarious to subcespitose; in grass under Douglas Fir to Western Red Cedar. September through November.
307a (301b) Stature large. Cap usually more than 10 cm 308
307b Stature small to medium. Usually 10 cm or less 317
308a Cap white, or creamy (yellow or tan at maturity); smooth or warty, cracking with age


308b Cap with yellow-brown, orange-brown, or dark-brown fibrils or scales 314
309a Stem lacking scales. Cap 15-20 cm A. crocodilinus v. mutabilis


thick; convex; white to dull tan with small appressed scales; flesh bright yellow where bruised. ODOR burnt almond or wet straw. GILLS tinged wine-pink at first, then dark brown. STEM lacking scales. RING median to superior, flaring, thick. HABITAT pastures or fields.
309b Stem base scaly or woolly below annulus, at least when very young, and cap usually smaller

310a Stem with rings of minute scales; growing in grass or woods 311

310b Stem woolly (sometimes only sparsely ringed with wooly substance in button stage)

311a Stem spindle shaped with scales in rings below double annulus, in grassy places A. osecanus


7-14 cm; white with minute squamules; tawny with age; flesh yellowing slightly or not. ODOR faintly sweet almond. GILLS pale, then grayish, then dark chocolate-brown. STEM 4-8(10) cm x 1.5-3.5 cm at base; solid. RING white. CHEMICAL cap yellowing with KOH. HABITAT in grassy places. EDIBLE best in button stage as mature specimens sometimes have a musty odor. REMARKS Kerrigan says A. nivescens may be the same species, and it would key here if it bruises ochraceous.
311b Stem slightly clavate or equal to slightly bulbous; silky above and/or finely floccose below annulus, in woods or near trees 312
312a Cap white, turns lemon yellow on bruising A. excellens


10-15 cm; silky; beautifully white, then with sulfur yellow tinge; margin with dentate border. ODOR faintly almond. GILLS flesh color, then blackish-brown. STEM 10-14 cm x 3-4 cm; slightly clavate; white; silky at apex; flesh in lower part of stem pinkish. RING pendulous, thick at edge; white. HABITAT in woods; August to October; infrequent.

312b Cap silvery white to lustrous grayish A. parkensis


6-10 (15) cm; with broad umbo; fibrils lustrous forming concentric zones; cap buff with age; flesh unchanging. ODOR & TASTE almond. STEM 9-12 x 1.5-2 cm above, 1.5-2.5 cm below; equal to slightly bulbous; unchanging, stuffed hollow; smooth, silky above, finely floccose below. RING supramedian, pendant; cogwheel; white. CHEMICAL flesh pale yellow with KOH. HABIT, HABITAT gregarious; near trees, associated with locust (Robinia) and oak.
313a (310b) Stem equal or slightly enlarged at base A. arvensis


(7)10-20 cm; white, then yellowish to buff; dry glabrous; stains or bruises yellow when young; ages yellowish. ODOR sweet almond (some say bitter almond when young), often musty with age. TASTE sweet, excellent. GILLS white, rarely pink, later grayish, finally dark blackish-brown. STEM 10-17 cm x 2-3 cm; small cottony scales midway to base in button stage. RING double, broadly flaring; cogwheel; white or tinged yellow with cottony patches on underside. CHEMICAL cap surface yellowing with KOH. HABITAT grasslands. EDIBLE for most people but causes gastric upset in some people. REMARKS There are two forms in the Pacific Northwest. Mainland: Tall and slender with thin pliant ring that bruises yellowish if rubbed hard. Islands: Squat with thick ring, bruises quickly.
313b Stem with marginate/rounded bulb A. coepiochraceus nom. prov.


7.5-15.5 cm; margin inrolled when young, nearly plane at maturity; creamy yellow, becoming ochraceous; dry; smooth at disc; appressed fibrils at margin. ODOR faintly to distinctly almond; disagreeable on staining. TASTE almond. GILLS pallid, gray-flesh color at first, then cinnamon-drab, then dark brown. STEM 7-16 cm x 2.5-4.5 cm; silken, creamy at apex; base cottony, mustard yellow where bruised. RING double, pendant, flaring, thick, cogwheel. CHEMICAL bright yellow with KOH. HABITAT Beaches. REMARKS Similar to A. excellens and the tall slender form of A. arvensis, differing in the ochraceous color, marginate bulb stipe base and beach habitat; bruises honey-yellow.

314a (308b) Stem glabrous to silky A. cervinifolius

CAP 10-20 cm broad; hemispheroid; dark brown appressed scales; yellowish when bruised; flesh thick at disc, thin at margin. ODOR & TASTE pleasant. GILLS pale vinaceous-fawn, then fawn to cinnamon-drab, finally dark purple-brown. STEM 8-16 cm x 2-3 cm; slightly bulbous; whitish gray to mouse-gray when older, bruising reddish-brown when handled. RING superior, collar-like; white, stained brownish where bruised. HABITAT at margins of conifer forests or horse pastures in November in Oregon; infrequent.
314b Stem floccose or scaly 315
315a Stem rarely enlarged at base, up to 30-35 cm long A. augustus


8-32 cm; marshmallow shaped in button; with abundant dark-brown scales on whitish to yellowish ground, sometimes brown-yellow where bruised or cut; flesh thick, meaty. ODOR fragrant almond-anise. GILLS pallid, briefly flesh color, later gray-brown, then blackish-brown. STEM 1-4 cm thick, equal; smooth above, floccose but not truly scaly below, tinged brownish. RING subapical, double, pendant, flaring, white with thick patches of pointed tips on underside. CHEMICAL immediately bright yellow with KOH. HABITAT in duff under conifers, in trash heaps and disturbed soil. EDIBLE and choice, but causes gastric upset in some people.

315b Stem equal above bulbous base, usually not over 15 cm long 316

316a Stem smooth above ring, deciduous fibrils below (see 107a) A. smithii

CAP 8-13 cm; with orangish cuticular pigment; abruptly bulbous stipe base; yellows with age. Look-alike A. subrufescens is usually smaller, with pinkish buff cap, rather stocky stature, and smaller spores (5.3-7.5 x 4.1-4.9 um as opposed to 6.4-9.8 x 4.5-6.4 um for A. smithii and 6.8-10.5 x 4.5-6.8 um for A. augustus).
316b Stem with buff wooly patches in rings below double annulus with blunt edge A. elwhaensis nom. prov.


12-35 cm; many dark-brown scales on pale ground; disc appressed; fibrillose; just under cuticle stains bright yellow, then orange. ODOR & TASTE mild almond. GILLS pale then grayish-wine. STEM 15 cm x 2 cm thick; equal above large submarginate bulb, tapering to short blunt soil insertion. RING superior, flaring; buff colored; upper surface satiny, lower surface felty; broken into areolate patches near margin. HABITAT in needle duff under Douglas Fir. EDIBLE.

317a (307b) Cap medium: 6-10 cm 318

317b Cap small: 6 cm or less 322

318a Cap with appressed scales; buff A. tenuiannulatus nom. prov.


8-12 cm; smooth; apex cracked with age; scales remaining appressed for life; button cushion shaped; slowly bruising ochraceous. ODOR slightly unpleasant almond. TASTE good. GILLS grayish in button then gray-brown. STEM 4-7 cm x 1-2.5 cm; white streaked yellowish with age; silky, smooth; slowly changing to pale ochre when handled or bruised; slight club at base. RING single; felty; fragile, evanescent. CHEMICAL cap surface yellows with KOH. HABITAT in lawns, cultivated areas. EDIBLE.

REMARKS A. subrufescens sometimes larger, with distinct almond odor, strongly sweet or taste of green nuts; smaller spores than A. augustus.
318b Cap smooth and white 319
319a Stem minutely fibrillose to floccose below ring, robust. Cap stains quickly amber then yellow with age A. albolutescens

9.5-10.5 cm; margin incurved when young; silken, smooth; white then tan; flesh where rubbed or cut turning intensely yellow. ODOR & TASTE pleasant almond-anise; older specimens disagreeable, like wet straw. GILLS grayish to grayish-rose, then reddish-brown. STEM 11-18 cm x 1.5-2 cm; base massively bulbous; satiny above annulus; white becoming tan in spots, yellow where bruised. (Thicker stipe than A. silvicola.). RING superior, double, flaring; undersurface areolate-patched; white, then buff. HABITAT in dense conifer woods. EDIBLE and choice, but some people adversely affected.
319b Stem smooth or floccose, stature slender or average. Cap staining slowly amber or yellow 320
320a Stem smooth with abrupt bulb at base A. silvicola


A. abruptibulbus is a synonym.)

CAP 5-6 cm; shiny, white, soon sulphur yellow, dark lemon yellow on bruising.

ODOR anise. GILLS long pale, then pinkish buff, then dark, finally blackish-brown. STEM 6-8 cm x 1-1.5 cm; with mycelial strands attached; hollow; white, sometimes reddish above ring; lemon yellow when bruised. RING superior, pendulous; white; with or without white or yellowish scales. HABITAT in dense conifer forests. EDIBLE with caution. (Be sure there is no volva, and that the gills are not white in mature specimens. The deadly Amanitas can be very similar in size, shape, and color.)
320b Stem smooth or floccose, equal or tapered 321
321a Stem about 7 cm long, smooth, equal. Staining violet at base A. fugaciovelus nom. prov.


7-9 cm; dry; white, then amber-white, finally lemon yellow. ODOR not notable. GILLS soon rosy pink, then slate-violet, finally brownish-drab. STEM 7cm x 1.5-2 cm; smooth, white, staining yellow near ring. RING lacking entirely when partial veil remnants adhere to pileal margin. When there is a ring, it is superior, narrow, flaring, with thick floccose-silky edge and stains intensely yellow. HABITAT In needles under cedar.

REMARKS Similar to A. coepiochraceus but lacks the flat marginate stipe base, has different coloring, and lacks the thick, persistent annulus of that species.
321b Stem 5.5 cm or less, floccose toward base, tapered, unchanging on cutting A. campestris v. lutescens nom. prov.


3.5-5.5 cm; smooth white, with distinct yellow staining when bruised. ODOR pleasant or none. GILLS broad, white, then pink, finally vinaceous-brown. STEM equal or tapered; satiny above, floccose toward base; white; flesh of stipe unchanging on cutting. RING single; thin, evanescent. HABITAT Artemesia-Agropyron shrub-steppe and Salix communities of Grant County, WA. REMARKS Very similar to A. equestris, differing as to color change, and the broad gills, and A. equestris yellows only at maturity.

22a (317b) Stem base with small bulb and small volva; rare A. involucratus nom. prov.

CAP 3.5 cm; smooth, suede-like; dingy white; dry; flesh thick and firm, yellowing slightly where bruised. ODOR inodorous. GILLS dingy, pale salmon-pink. STEM 3.5-4 cm long x 1.2-1.3 cm thick with 1.5 cm bulb at base. RING thin, membranous, sheathed both up and down; brown. HABITAT in bare soil. EDIBILITY not recommended as edible because of resemblance to the poisonous Amanita species.
322b Stem base various, lacking a volva 323

323a Growing in grassy areas (lawns, meadows, etc.) 324

323b Growing in forested or wooded areas 325
324a Cap at first convex; white when young then buff with a few brownish squamules, brown-yellow on bruising; gills brown-pink when young A. comptulus


2-5 cm broad; sometimes with universal veil remnants on margin; white young then buff with a few brownish squamules; creamy yellow to ochraceous where bruised. ODOR faintly almond-anise. GILLS at first pink, then reddish-brown to blackish brown with age. STEM 3-4 cm x 0.5-0.7 cm; whitish, yellowing slightly at base; equal. RING pendulous; thin, flaring. CHEMICAL quickly bright yellow with 15% KOH. HABITAT always in grass; infrequent. EDIBLE.
324b Cap at first pulvinate (disc flattened), with fibrils pinkish-red, in age darkening to gray-brown or darker brown; sometimes bruises yellowish, gills "grayish when young, soon pinkish" (Peck) A. micromegathus


2-6 cm broad; streaked with tiny vinaceous-brown scales; surface bruises saffron yellow to ochraceous; flesh thin and fragile; unchanging or bruising yellowish. ODOR sweet almond-anise. GILLS grayish then pinkish, finally chocolate-brown or red-brown. STEM 2.5-3 cm x 0.2-0.8 cm; equal or thickened at base; fibrillose; white. RING single; cottony and delicate. CHEMICAL is bright-yellow with 3-15% KOH. HABITAT in grass, open fields. EDIBLE.

REMARKS A. peckii nom. prov. has larger spores, tastes nutty and is negative with KOH.
325a (323b) Cap diameter less than 3 cm; gills very narrow (± 1 mm broad); rare A. gracilifolius nom. prov.


usually 2 cm; rosy-lilac between brown umbo and whitish margin. GILLS subdistant; pink then grayish violaceous pink. STEM 3.5 cm x 0.3 cm; equal or with slightly thickened base; white on yellowish ground. RING superior, ample; white to pallid. CHEMICAL Cheilocystidia brownish yellow with KOH. HABITAT on leaf mold.
325b Cap diameter more than 3 cm; gills broader than 1 mm 326

326a Stature comparatively tall & slender (stem diameter less than 4 mm but length 1.5-2.5 x cap diameter) 327

326b Stature more average (stem diameter more than 4 mm and length approximately equal to cap diameter) 328

27a Cap umbonate-mammillate (with breast & nipple shape); (hyphae of annulus lacking orange inclusions when dried material is mounted in KOH); rare A. comptuloides

CAP 3-4 cm; with pinkish-brown umbo, surface rosy-isabelline; slightly fibrillose. ODOR not noted. GILLS in age blackish-brown. STEM 7 cm x 0.4-0.5 cm thick; smooth; white then yellow where handled or in age; pinkish above ring. RING pendant; white, scant. HABITAT in mixed evergreen litter.

327b Cap not umbonate; (hyphae of annulus filled with orange inclusions when mounted in KOH); frequent A. diminutivus


2.5-4 cm; with amethyst-gray fibrils, purplish-pink at disc with appressed pink or rosy-red scales, yellowing where bruised; margin incurved. ODOR pleasant almond. GILLS grayish-pink at first then reddish-black. STEM 3-5 cm x 0.1-0.3 (0.4) cm thick; smooth; equal to slightly rounded-bulbous base becoming yellowish. RING superior; white, apricot-orange on drying or with age. CHEMICAL lamellar section intensely dark yellow with 3% KOH. HABITAT under conifers.

REMARKS Look-alike A. hotsoni has spores with evident truncate distal end. Rare.
328a (326b) Stem clavate; cap creating fibrillose appearance until very mature; background color white, bruising yellow, aging drab and bruising orange; frequent A. semotus


2-5 cm; silky, fibrils reddish-brown, rosy-grayish at disc and margin; buttons convex to semi-cylindrical; flesh brittle. ODOR & TASTE distinct anise. GILLS grayish-wine, pruinose. STEM 5-7.5 cm long x 0.5-0.7 cm thick. RING single, flaring, evanescent. CHEMICAL bright yellow with KOH. HABITAT under conifers or mixed trees, under oak. EDIBLE.
328b Stem equal to a rounded bulbous base; fibrils grouped in small batches to create slightly squamulose look; background color of margin light grayish, bruises ochraceous A. purpurellus


4-4.5 cm; wine red at disc; buttons cushion shaped. ODOR daintily fragrant anise. GILLS pale grayish-wine then reddish. STEM 3.5-7 cm x 0.5 cm thick; white or pallid, often staining yellowish; sometimes slightly tufted at base. RING single, thin, evanescent; white. CHEMICAL yellow with KOH. HABITAT open woods. EDIBLE but may be confused with species of Inocybe, most of which are poisonous.

REMARKS A. amethystina and A. purpurellus are considered part of the A. diminutivus group because of their petite size, red to purplish cap color, and woodland habitat. Both yellow with KOH.


1. Arora, David. 1986 Mushrooms Demystified Second Edition. Ten Speed Press, Berkeley.

2. Isaacs, Bill Forgust. 1963. A Survey of Agaricus in Washington, Oregon, and California. Thesis for Master of Science, University of Washington.

3. Kerrigan, Richard W. 1986. The Agaricales (Gilled Fungi) of California. 6. Agaricaceae. Mad River Press. Eureka, California.


annulus ring or collar or tissue on stipe formed by ruptured veil

appressed flattened down (ironed down)

areolate cap surface marked with cracks

clavate like a caveman's club

concentric having teeth or pointed projections

conifer cone bearing

dentate having rings or zones

disc center of the cap

dry cap or stalk neither viscid or hygrophanous

evanescent soon disappearing

fibril thin threadlike fiber

fibrillose cottony or wooly

hygrophanous watery appearance when moist, opaque when dry

hyphae (plural) threadlike fungal cells

marginate having a distinct margin

membranous thin and pliant

ochraceous yellow-orange with a brownish tinge

pendant hanging down, skirt-like

pruinose looking as if finely powdered

pulvinate disc flattened, cushion shaped

recumbent hangs down, rests on surface from which it extends

rufescent becomes reddish

scabrous roughened by short projecting scales

squamous furnished with scales, scaly

striate ridged, marked with lines or grooves

terete cylindrical and usually tapering at both ends

tomentose covered with hairs

truncate larger portion ending as if cut off, having the end square

ventricose markedly swollen or inflated

vinaceous the color of wine


A. abruptibulbus (see A. silvicola)

A. albolutescens Zeller 319a 11

A. annae Pilát 205a 6

A. arvensis Schaeffer 313a 9

A. augustus Fr. 315a 10

A. benesii (Pilát) Singer 202a 5

  1. A. bisporus (Lange) Imlach, = A. brunnescens Peck 206a 6

A. bitorquis (Quélet) Sacc., = A. rodmani Peck 103a, 204a 3, 5

A. brunnescens (see A. bisporus)

A. californicus Peck 306a 8

A. campestris Fr. 105a 4

A. campestris v. lutescens nom. prov. Isaacs 321b 11

A. cervinifolius (Zeller) Hotson 314a 9

A. coepiochraceus nom. prov. Isaacs 313b 9

A. comptuloides Murrill 327a 12

A. comptulus Fr. 324a 12

A. crassistipus nom. prov. Isaacs 306b 306b

A. crocodilinus Murrill v. crocodilinus 101a 3

A. crocodilinus v. mutabilis nom. prov. Isaacs 309a 8

A. diminutivus Peck 327b 12

A. elwhaensis nom. prov. A.H.Sm. 316b 10

A. excellens (Moeller) Moeller 312a 9

A. flavitingens Murrill 208a 6

A. fugaciovelus nom. prov. Isaacs 321a 11

A. gracilifolius nom. prov. Isaacs 325a 12

A. haemorrhoidarius Schulz. apud Kalchbr. 202b 5

A. helodes nom. prov. Isaacs 303a 7

A. hondensis Murrill 304a 7

A. hotsoni. nom. prov. Isaacs 327b 13

A. integer nom. prov. 104a 4

A. involucratus nom. prov. Isaacs 322a 11

A. lamellodistans nom. prov. Isaacs 108a 5

A. lilaceps Zeller 208b 6

A. meleagris (see A. praeclaresquamosus)

A. micromegathus Peck 324b 12

A. nivescens v. nivescens (Moeller) Moeller 104b, 311a 4, 9

A. nivescens v. parkensis (Moeller) Moeller (See A. parkensis)

A. osecanus Pilát 104b, 311a 4, 9

A. parkensis (Moeller) Kerrigan 104b, 312b 4, 9

A. peckii nom. prov. Isaacs 324b 12

A. praeclaresquamosus Freeman, = A. meleagris (J. Schaeffer) Imlach 305a 7

A. purpurellus (Moeller) Moeller 328b 13

A. rodmani v. rodmani (see A. bitorquis)

A. semotus Fr. 328a 13

A. silvaticus Schaeff.: Fr. 207a 6

A. silvicola (Vitt.) Peck, = A. abruptibulbus Peck 320a 11

A. smithii Kerrigan 107a, 316a 4, 10

A. subrufescens Peck 316a, 318a 10

A. subrutilescens Kauffman 106a, 203a 4, 5

A. subsolidipes nom. prov. Isaacs 108b 5

A. sylvaticus (see A. silvaticus)

  1. A. sylvicola (see A. silvicola)

A. tenuiannulatus nom. prov. 318a 11

A. xanthoderma 302a 7

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