A. Lichens are a symbiotic relationship between a mycobiont (fungal partner) and photobiont (green algae or cyanobacteria). The basic structure of a lichen is a mass of fungal hyphae; inbedded in this mass is a zone of algae . For many years, people used to think lichens were one species. A lichen is a combination of two organisms, a green alga or cyanobacterium and an ascomycete fungus, living in a symbiotic relationship. Lichens are sensitive to atmospheric pollution. The prevailing definition of a lichen is that it arises from a symbiosis between a fungus and a photosynthesizing alga or bacteria. The identification of lichen as a composite organism of cyanobacteria or algae and fungi dates back 150 years, representing the first identification of such intimate symbiosis. The alga or bacteria provides food through photosynthesis. User: Kelp are multicellular photosynthetic protists that make up kelp forests. Lichens result from the symbiotic union between fungi and algae or fungi and cyanobacteria. Ed Reschke /Oxford Scientific/Getty Images. TribLIVE's Daily and Weekly email newsletters deliver the news you want and information you need, right to your inbox. Whereas algae normally grow only in aquatic or extremely moist environments, lichens can potentially be found on almost any surface (especially rocks) or as epiphytes (meaning that they grow on other plants). A lichen is a symbiotic association of an alga and a fungus--mutualism. Whereas algae normally grow only in aquatic or extremely moist environments, lichens can potentially be found on almost any surface (especially rocks) or as epiphytes (meaning that they grow on other plants). This species is very common and grows on bark of all kinds of trees in partial shade or sun. Symbiosis. Paul G. Wiegman Sun., January 7, 2007 12:00 a.m. | Sunday, January 7, 2007 12:00 a.m. Join the conversation () Email Newsletters . The fungal component is called mycobiont while the algae component is called phycobiont. These forests are found in the cold nutrient-rich water off the coast of California. B. Mycobiont: primary mycobiont are mainly Ascomycota, with a few Basidiomycota; recent evidence suggests that Basidiomycota might be a second partner C. Lichens come in different forms - hairlike, crustose, foliose, fructicose, clubby. The symbiotic relationship between algae and fungi is lichen . The fungi provide protection and moisture to the algae, and the algae feed the fungi with photosynthetic nutrients. A lichen is a combination of two organisms, a green alga or cyanobacterium and an ascomycete fungus, living in a symbiotic relationship. Lichen represents symbiotic relationship. The fungus of lichens have a mutualistic symbiotic relationship with algae. Lichens:an obligate symbiotic relationship & mycorrhizae. 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