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Kärnefelt, I/ Mattsson, J-E/ Thell, A 1993: The lichen genera Arctocetraria, Cetraria, and Cetrariella (Parmeliaceae) and their presumed evolutionary affinities. - The Bryologist 96(3): 394-404. [RLL List # 153 / Rec.# 9608]
Abstract: 15 fig. [Six species previously placed in Cetraria (sensu stricto) are removed, some to new segregate genera based in large part on ascus-tip structure. New: Arctocetraria Kärnef. & Thell gen. nov., A. andrejevii (Oxner) Kärnef. & Thell comb. nov., A. nigricascens (Nyl. in Kihlman) Kärnef. & Thell comb. nov., Cetrariella Kärnef. & Thell gen. nov., C. delisei (Bory ex Schaerer) Kärnef. & Thell comb. nov., C. fastigiata (Del. ex Nyl. in Norrlin) Kärnef. & Thell comb. nov., Tuckermannopsis inermis (Nyl.) Kärnef. comb. nov., T. subalpina (Imshaug) Kärnef. comb. nov.]

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