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1 December 2003 Nomenclature and typification in the genus Usnea (lichenized Ascomycetes)—I. Usnea rigida
James C. Lendemer, Isabelle I. Tavares
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Recent work has led to the discovery that Usnea rigida (Acharius) Motyka has been mis-interpreted by many authors and that the nomenclatural implications of its re-interpretation affect the use of some other names. The following errors are corrected: U. rigida (Acharius) Motyka should be cited as U. rigida Motyka and is not synonymous with U. florida var. rigida Acharius; U. florida var. rigida is lectotypified and placed in synonymy with U. florida (L.) Wigg.; U. rigida Vainio has priority over U. rigida Motyka; U. welwitschiana Motyka is regarded as a superfluous name. U. quasirigida, nom. nov., is introduced for U. rigida Motyka (non U. rigida Vainio).

James C. Lendemer and Isabelle I. Tavares "Nomenclature and typification in the genus Usnea (lichenized Ascomycetes)—I. Usnea rigida," Proceedings of the Academy of Natural Sciences of Philadelphia 153(1), 177-180, (1 December 2003).[0177:NATITG]2.0.CO;2
Published: 1 December 2003
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