Lecanora thysanophora R. C. Harris, n. sp. is described. It is a common lichen in eastern North America, most often found as a sterile corticolous crust, but apothecia are not uncommon when the species grows along streams. Besides being recognizable in the field, it is distinctive chemically, containing usnic acid, zeorin, often porphyrilic acid, and several species-specific terpenoids.
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Harris et al. (2000) studied this question.
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