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Lichen Flora in Chandra Sal Forest: Occurrence, Distribution and Abundance

NUHU ALAM
Department of Botany, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

M.A. GAFUR
Corresponding author: Department of Botany, University of Chittagong, Chittagong-4331, Bangladesh.

Abstract/ Executive Summary:

Occurrence of lichen flora in Chandra Sal Forest of Gazipur district, Bangladesh revealed 12 taxa under 2 genera of lichens. These are Anaptychia sp., Anthracothecium variolosum, Bacidia luteola, Chiodecton philippinum, Dimelaena sp., Graphis scripta, Lecanora rugosa, Leptogium sp., Parmelia conspersa, Pertusaria sp., Rhizocarpon sp. and Tylophoron moderatum.The taxa were identified from four different locations of Chandra Sal forest. Symbiotic relationship between algae and fungi revealed that a total of five algal genera namely, Anabaena sp., Gloeocapsa sp., Nostoc sp., Protococcus sp. and Trentepohlia sp. were found to form the thalli of lichens individually with ascomycetous fungi. Nostoc sp. and Protococcus sp. each was found separetely in four lichens.

Keywords: Lichen, Occurrence, Distribution, Abundance, Sal forest

Location: Chandra Sal forest such as north, south, east and west sites

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Non-commodity: Performance

Objectives:

The present research work was undertaken to investigate the occurrence, distribution and abundance of lichens in Sal (Shorea robusta Gaertn.) forest and to isolate and identify fungi and algae from lichens.

Methodology:

Lichen samples were collected from four sites of Chandra Sal forest such as north, south, east and west sites. From each site five different trees of same species were randomly selected. Sharp knife and a scalpel were used for collecting whole thallus of the lichens from the bark kept in airtight polyethylene bags and brought to the laboratory. All the samples were preserved in the refrigerator until identification and microscopic study. The samples were observed and studied under simple microscope. Each thallus was sectioned and fungal structure was separated from the algal component. The fungal body was mounted on slides in lactophenol as well as in cotton blue. Slides were prepared for identifying the isolated lichens by using different chemicals. The chemicals used for softening the sample tissues were: iodine solution (0.5%), potassium hydroxide solution (0.5%), calcium chloride solution (0.5%) and glycerin (30%). The fungi were identified with the help of keys outlined by Chopra and Chowdhury (1934) and Mishra and Agarwal (1978). In order to isolate algal components from the collected lichens of Sal trees, small piece of lichen thallus was separated from the whole body by a sharp blade and placed in the sterilized Chu-10D medium for culture. After 21 days algal growth was observed and identified. The presence of lichen thalli on four different sides of Chandra Sal forest. During the investigation seven species of lichens under five genera were identified. The identified lichens were Anaptychia sp., Anthracothecium variolosum, Bacidia luteola, Chiodecton philippinum, Dimelaena sp., Graphis scripta, Lecanora rugosa, Leptogium sp., Parmelia conspersa, Pertusaria sp., Rhizocarpon sp. and Tylophoron moderatum.

Source of Information: Bangladesh J. Bot. 37(1): 61-65, 2008 (June)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present investigation revealed wide variability in the association of fungi and algae as well as their distribution in the Sal Forest of Chandra, Gazipur, Bangladesh.

Knowledge Management: Journal