A Revision of the North American Species of Stereophyllum and Pilosium, with Descriptions of Some South American Species

Abstract

Plants slender to rather robust; stems creeping, with more or less numerous rhizoids on the underside, irregularly branching in most species; usually complanate-foliate, leaves ovateto oblong-lingulate, ovate-lanceolate, oblong or elliptic, acute or obtuse, mostly planemargined, entire or serrulate above, the lateral leaves asymmetric with the narrower margin often somewhat incurved; costa extending to the middle of the leaf or beyond; leaf cells rhombic (subgenus (Eustereophyllum) to linear (subgenus Moneurium), smooth to papillose; quadrate alar cells numerous; capsules suberect to curved and cernuous, often contracted below the mouth when dry and empty, ovoid to subcylindric; calyptra cucullate, smooth; operculum conic to short rostrate; peristome perfect, hypnaceous, the inner from a basal membrane with cilia often present, segments linear-lanceolate, entire or split between articulations.

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