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Truong, C./ P. Clerc 2012: The lichen genus Usnea (Parmeliaceae) in tropical South America: Species with a pigmented medulla, reacting C+ yellow. - Lichenologist 44(5): 625-637. [RLL List # 233 / Rec.# 35082]
Keywords: chemistry/ endemism/ morphology/ Neotropics/ taxonomy/ Parmeliaceae/ Usnea/ Usnea ceratina
Abstract: In tropical South America (Venezuela, Colombia, Ecuador, Peru, Bolivia and Brazil), we investigated the diversity of Usnea species with a pigmented, C+ yellow medulla. Four species are treated: the sorediate U. ceratina and U. entoviolata, the latter being new for South America, and the non-sorediate U. cristatula and U. flavorubescens, the latter being newly described here. A detailed description is provided for each species together with an identification key. Copyright © British Lichen Society 2012.

URL: http://dx.doi.org/10.1017/S0024282912000400

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