Kärnefelt, EI/ Emanuelsson, K/ Thell, A 1998: Anatomy and systematics of usneoid genera in the Parmeliaceae. - Nova Hedwigia67: 71-92. [RLL Suppl.] Keywords: USNEACEAE
Abstract: Comparison of anatomical characters of eleven genera (Bryocaulon, Chondropsis, Cornicularia, Evernia, Everniopsis, Himantormia, Letharia, Lethariella, Protousnea, Pseudevernia and Usnea).
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