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A Re-appraisal of the Type Material of Plagiothecium drepanophyllum

Abstract The type material of Plagiothecium drepanophyllum Renauld & Cardot from Cocos Island off the Pacific coast of Costa Rica is re-assessed, and some details of its gametophyte are illustrated. It is inseparable from, and thus synonymous with Lepidopilum scabrisetum (Schwägr.) Steere. Accordingly the correct name for the widely distributed and most common Neotropical species of Plagiothecium, which has so far been called P. drepanophyllum, is P. standleyi E. B. Bartram, described from Guatemala. The type material of P. standleyi is briefly assessed and some of its diagnostic characters are illustrated.