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Lobaria (order Peltigerales) A genus of lichens in which the thallus is foliose, often large, with short, felt-like hairs on the lower surface. The phycobiont may be a green alga or a cyanobacterium, according to the species. Spores are colourless or pale brown, fusiform to elongated, with 1 to many septa. Lobaria is found chiefly in moist districts (in Britain in the west) on trees or occasionally on rocks.