Project Update: November 2010




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Project Update: November 2010
The sampling was done by laying 50 x 10m transects at proposed sites. The lichen communities were searched along transects distributed in different types of vegetation. We recorded climatic factors like light intensity, temperature, humidity, rainfall and altitude of all the habitats and also recorded the host specificity of the lichens. The species abundance and species richness will be determined. In the present collection, corticolous lichens dominated and terrricolous were less prevalent - details given in Fig 1. A different group of algal species were support for lichen formation in the identified lichen species (Fig 2).

Fig 1: Percent of lichens which were growing on different substrates




Fig 2: Chart showing association of different groups of algae in lichen formation in the identified lichen species.


Table 1: Association of some algal species in lichens



Sl. No.

Lichen genus

Algal partner

1

Bulbothrix

Trebouxia

2

Caloplaca

Pseudotrebouxia

3

Canoparmelia

Trebouxia

4

Candelaria

Trebouxia

5

Cladonia

Pseudotrebouxia

6

Coccocarpia

Scytonema

7

Collema

Nostoc

8

Dirinaria

Trentepholia

9

Endocarpon

Trebouxia

10

Everniastrum

Trebouxia

11

Evernia

Trebouxia

12

Flavopunctelia

Trebouxia

13

Heterodermia

Trebouxia

14

Hypotrachyna

Trebouxia

15

Lepraria

Stichococcus

16

Lecanora

Trebouxia

17

Leptogium

Nostoc

18

Lobaria

Myrmecia

19

Nephroma

Nostoc

20

Parmeliella

Scytonema

21

Parmotrema

Trebouxia

22

Peltigera

Coccomyxa

23

Peltula

Nostoc

24

Physciea

Trebouxia

25

Phaeophyscia

Trebouxia

26

Physma

Nostoc

27

Pseudocyphellaria

Chlorella

28

Pyxine

Nostoc

29

Ramalina

Trebouxia

30

Rimelia

Trebouxia

31

Roccella

Trentepholia

32

Sticta

Myrmecia

33

Usnea

Trebouxia

34

Xantoria

Trebouxia

Microhabitat preference of particular lichens is responsible for their differential distribution. However, in spite of their abundance in the vegetation only a small fraction of trees actually harboured lichens on trunk. Many of these trees have bark which is somewhat smooth, medium and rough in texture. We studied the texture, pH and moisture content of barks of different host trees in different forest types.



Table 2: Showing bark texture, moisture, pH and number of colonies on different host tree species in deciduous forest.


Sl. No.

Host tree

Bark texture

Bark moisture

Bark pH

No of colonies

Dominant genera

1

Anogeissus latifolia (Roxb. ex DC.) Wall. ex Guill. and Perr.

Smooth

17.4

4.9

2

-

2

Bauhinia malabarica Roxb.

Moderate

21.2

5.5

9

Parmotrema

3

Butea monosperma (Lam.) Taub.

Moderate

12.9

5.5

5

-

4

Canthium sp.

Moderate

12

6.8

12

-

5

Cassia siamea Lamk.

Rough

11.5

5.5

11

Heterodermia

6

Cassine glauca (Rottb.) Kuntze

Rough

9.6

4.8

14

Parmotrema and Pyxine

7

Dalbergia latifolia Roxb.

Moderate

21

5.6

9

Parmotrema

8

Delonix regia (Bojer ex Hook.) Raf.

Moderate

18

5.4

8

Parmotrema

9

Diospyros melanoxylon Roxb.

Very Rough

14.6

6.4

17

Pyxine and Dirinaria

10

Diospyros montana Roxb.

Rough

11.6

6.5

12

Pyxine

11

Ficus racemosa L.

Moderate

23.7

5.7

14

Parmotrema

12

Grewia tilifolia Vahl.

Rough

9.8

6.1

10

Pyxine

13

Lagerstroemia microcarpa Wight

Smooth

18.3

4.9

4

-

14

Maduca latifolia (Roxb.) Macbride

Moderate

16.4

6.4

9

-

15

Polyalthia cerasoides (Roxb.) Bedd.

Rough

13.4

6.3

15

Parmotrema

16

Polyalthia longifolia (Sonn.) Thw.

Moderate

17.3

6.1

13

Drineria

17

Pterocarpus marsupium Roxb.

Rough

20.2

6.2

12

-

18

Radermachera xylocarpa (Roxb.) K. Schum.

Moderate

15.3

5.7

11

-

19

Randia dumetorum (Retz.) Poir.

Moderate

15.4

6.1

19

Parmotrema

20

Santalum album L.

Moderate

17

5.9

12

Ramalina

21

Schefflera oleosa (Lour.) Oken.

Rough

12.8

5.6

10

-

22

Syzygium cumini (L.) Skeels

Rough

16.2

4.8

7

Parmotrema

23

Tectona grandis L. f.

Rough

12.8

4.6

6

Hetrodremia

24

Terminalia bellirica (Gaertn.) Roxb.

Moderate

14.7

4.8

6

-

25

Terminalia paniculata Roth

Rough

13.8

5.6

15

Parnotrema

26

Terminalia tomentosa (Roxb. ex DC.) Wight and Arn.

Very Rough

15

5.8

8

-

27

Wrighitia tomentosa Roem. And Sch.

Moderate

15.3

5.1

12

-

28

Xylia xylocarpa (Roxb.) Taub.

Rough

14.3

5.1

10

Ramalina

29

Ziziphus xylopyrus (Retz.) Willd.

Moderate

9.8

5.8

9

Bulbothrix

30

Ziziphus rugosa Lam.

Rough

18.5

5.1

11

Heterodermia


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