Calymperaceae

Diagnosis: Plants mostly tufted, with erect, mostly simple stems. Cells of upper lamina isodiametric or transversely elongate; leaf margins generally thickened but mostly lacking elongate, hyaline cells; teniolae, gemma receptacles and highly modified gemmiferous leaves common. Capsules exerted; peristomes lacking. Calyptra plicate, persistent, enclosing the capsule, clasping the operculum by its rostrum and twisting around the seta below, bearing vertical slits above through which the spores escape.

Notes: Crum & Anderson, "The genus was so named because the calyptra forms a covering which surpasses (and encloses) the capsule (resulting in a secondary dehiscence through a slit in the side of the calyptra). The large, clasping, plicate calyptra is distinctive, as is the intramarginal border generally found in the leaves."