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Peltigera
''Peltigera'' is a genus of approximately 100 species of foliose lichen, foliose lichens in the family (biology), family Peltigeraceae. Commonly known as the dog or pelt lichens, species of ''Peltigera'' are often terricolous lichen, terricolous (growing on soil), but can also occur on moss, trees, rocks, and many other in many parts of the world. Most species of ''Peltigera'' have the cyanobacterium ''Nostoc'' as the dominant Lichen, photobiont but some have the algae ''Coccomyxa.'' The presence of both a green alga and a cyanobacterium makes some tripartite; in this case they show cephalodium growths containing the third partner, ''Nostoc''. Because of their ability to nitrogen fixation, fix nitrogen from the atmosphere, such lichens are influential in soil composition and generation. Description Species of ''Peltigera'' are Foliose lichen, foliose, with broad lobed thallus, thalli. Although the size of the thalli is variable and species-dependent, in some species the thalli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalodium
{{Short description, Morphological structure found in some lichens Cephalodia (singular cephalodium) are small gall-like structures found in some species of lichens that contain cyanobacteria Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, blu ...l symbionts. Cephalodia can occur within the tissues of the lichen, or on its upper or lower surface. Lichens that have both green algal and cyanobacterial symbionts restrict the cyanobacteria to cephalodia. Lichens that have only cyanobacterial symbionts do not have cephalodia: instead the cyanobacteria are widely distributed throughout the lichen. Lichens with cephalodia can fix nitrogen, and can be an important contributor of nitrogen to the ecosystem. References *Brodo, I. M., S. D. Sharnoff, and S. Sharnoff. 2001. Lichens of North Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
