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Lichens - College Papers

Lichens

LICHEN. On places like tree trunks, rocks, old boards, and also on the ground grow strange splotches of various-colored plant life called . They are of great scientific interest because they are not single plants; instead, each lichen is formed of a fungus and an alga living together so intimately as to seem a single plant. The are one of the best illustrations of symbiosis, the intimate living together of two different kinds of organisms. The fungus makes the bulk of the body with its interwoven threads, and in the meshes of the threads live the algae. The special fungi that take part in this arrangement are almost never found growing separately, but the algae are found growing free. ...

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most cannot survive in industrial air pollution. There are notable exceptions, however: in England, for example, Lecanora conizaeoides is actually confined to areas of high pollution.
The body of the lichen, the thallus, has three basic growth forms. These forms are crustose, foliose, and fruticose. Each form is adapted to live under different moisture conditions. The crustose resemble a crust that has become attached to a surface and are well suited to dry areas. Foliose, or leafy, need much greater amounts of water. Some of them even grow on rocks in streams. Fruticose thrive in humid regions, where they are able to absorb water from the air. In desolate areas, when growth conditions are at their best and there is little competition, will expand over vast areas. have a peculiar and effective method of reproducing. Upon the surface of the body there are often minute granules that give it a dusty appearance. Each of these granules, called soredia, consists of a few cells of ...

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Lichens. (2004, January 16). Retrieved November 23, 2024, from http://www.essayworld.com/essays/Lichens/1548

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PAPER DETAILS

Added: 1/16/2004 07:54:59 AM
Category: Science & Nature
Type: Premium Paper
Words: 571
Pages: 3

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