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Abstract
Porothamnium frahmii Enroth sp. nov. (Neckeraceae, Musci), known from Colombia and Peru, is described and illustrated. It is compared with Porotrichum substriatum (Hampe) Mitt., P. longirostre (Hook.) Mitt., Porothamnium filiferum (Mitt.) Fleisch., and P. expansum (Tayl.) Fleisch., with which it might be confused. The sporophyte of Porotrichum substriatum is described for the first time. Porothamnium stipitatum (Mitt.) Touw ex De Sloover, previously known only from Africa, is reported from French Guiana.