Pseudocrossidium perpapillosum M.J.Cano & J.A.Jiménez is described and illustrated as a new South American species from Argentina and Chile. It differs from other species of Pseudocrossidium R.S.Williams by the costa excurrent in an awn, elliptical in cross-section, with 4–5(6) guide cells, marginal laminal cells differentiated with rounded, thin-walled and papillose cells, paracostal distal cells with 1–2(4) bi- to quadrifurcate, long papillae, and perichaetial leaves differentiated.
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