whats this .........
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it is very small grey or yellow plant that spreads over the surface of rocks, walls and trees and does not have any flowers
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it is a symbiosis between different organisms - a fungus and an alga or cyanobacterium. Cyanobacteria are sometimes still referred to as 'blue-green algae', though they are quite distinct from the algae.
A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. The combined lichen has properties different from those of its component organisms. Lichens come in many colors, sizes, and forms.
ex-tree lungwort, reindeer lichen, oakmoss
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