Two new species of Schistidium (Grimmiaceae, Bryophyta) from western North America

Abstract

Schistidium splendens and Schistidium squarrosum are described as new species from western North America. Schistidium splendens is characterized mainly by 2-stratose striae in the distal leaf laminae, thick and strongly recurved leaf margins, relatively short awns, and more or less isodiametric or short-elongate, irregularly shaped exothecial cells. Schistidium squarrosum is characterized by often abruptly narrowed, ovate-lanceolate, usually curved or falcate leaves that often lack awns, 2(–3) stratose upper leaf laminae, and large, broadly ovate-lanceolate or lanceolate perichaetial leaves that tightly surround the capsule.