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Lepraria (form order Agonomycetales) A form genus of imperfect lichens, in which the thallus is powdery and indeterminate. L. incana forms pale greenishgrey powdery crusts in damp, shady places, e.g. on tree roots; it is common. L. candelaris forms bright, golden-yellow patches on tree trunks, especially in crevices in the bark of oak trees.