: 3 Lichens do not have roots that absorb water and nutrients as plants do, : 2 but like plants, they produce their own nutrition by photosynthesis. Common names for lichens may contain the word moss (e.g., " reindeer moss", " Iceland moss"), and lichens may superficially look like and grow with mosses, but they are not closely related to mosses or any plant. Here, "macro" and "micro" do not refer to size, but to the growth form. Ī macrolichen is a lichen that is either bush-like or leafy all other lichens are termed microlichens. ![]() They may have tiny, leafless branches ( fruticose) flat leaf-like structures ( foliose) grow crust-like, adhering tightly to a surface (substrate) like a thick coat of paint ( crustose) have a powder-like appearance ( leprose) or other growth forms. They come in many colors, sizes, and forms and are sometimes plant-like, but are not plants. ![]() ![]() Lichens have properties different from those of their component organisms. Collema nigrescens is gelatinous, without internal structure for its parts.Ī lichen ( / ˈ l aɪ k ən/ LY-kən, UK also / ˈ l ɪ tʃ ən/ LITCH-ən) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.
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