Squamulose Lichens. They are usually grayish-green, but may also be yellow or red. There are three major types of lichens, although other types exist as well. There are about 13,500 species of lichen on the Earth. The species of Ascomycetes or Basidiomycetes are the most common fungi in lichens. Lichen planus (LIE-kun PLAY-nus) is a condition that can cause swelling and irritation in the skin, hair, nails and mucous membranes. Substrate is also important; a lichen growing on organic tree bark teeming with nutrients will grow at a different rate than a lichen growing on an inorganic solid rock. Several different kinds of lichens may be found growing together, such as blade lichen, gold eye lichen and gray star lichen… The photosynthetic partner is generally green algae or cyanobacteria. The growth rate of lichens is variable and depends on multiple factors, including the species of lichen. Lichen Diversity. Lichens use hyphal bundles called rhizines to attach to the substrate. Crustose lichens form crusts over rocks, soil, tree trunks or roof shingles. Type # 1. Crustose (Crustaceous) Lichens: The thallus is of insignificant size. Crustose (Crustaceous) Lichens 2. Foliose lichens have leaf-like lobes. Lichen, any of about 15,000 species of thallophytic plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi (mostly ascomycetes and basidiomycetes). Foliose (Foliaceous) Lichens 3. Lichens are found worldwide and occur in a variety of environmental conditions. Fruticose Lichens 4. There are three major growth forms of lichens: foliose, fructicose, and crustose.
The major types of lichens are crustose, foliose and fruticose. Subpages (3): Crustose Lichens Foliose Lichens Fruticose Lichens. The three main types of lichens are: Click on the subpages below or the links in the menu on the left for in order to find information on each lichen type. Lichens are classified as fungi and the fungal partners belong to the Ascomycota and Basidiomycota. p47–48 This allows specimens to be put into boxes and labelled. A lichen looks like a single organism, but it is actually a symbiotic relationship between different organisms. There are three major types of lichens, although other types exist as well. Intermediate types include leprose and squamulose lichen, among others. Crustose lichens attach firmly to their surface, forming rough patches. Their growth is slow. The three types of lichens include many subgroups due to the many variations of lichen body types. Lichen, any of about 15,000 species of thallophytic plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi (mostly ascomycetes and basidiomycetes). Lichens that are tightly attached to the substrate, giving them a crusty appearance, are called crustose lichens. A lichen, or lichenized fungus, is actually two organisms functioning as a single, stable unit. Lichens have greyish, yellow­ish, greenish, orange, dark brown or blackish colouration. Normally, fungal partners cannot live without its phycobiont, but algae are often capable of living independently in water or moist soil. Some lichens of arctic region are believed to be 4500 years old.


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