Describe the different forms of lichen? 

Lichens are unique and diverse organisms that are formed by the symbiotic relationship between fungi and algae or cyanobacteria. They are found in a wide range of habitats, from arctic tundra to tropical forests, and can take many different forms and structures. Some of the most common forms of lichen include:

Foliose lichens: These are flat, leaf-like lichens that are attached to the substrate by small, root-like structures called rhizines. They are usually found growing on rocks, trees, or soil and can range in size from a few millimeters to over a meter in diameter. Foliose lichens are usually green or brown, and their surface _____ ____ ____ _____ _________ ________.
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