Trematodon mayottensis Besch.

Plants small, gregarious or in loose tufts, light green; terricolous. Stems (l-)2-3 mm high, simple; in section central strand large, cortical cells large, becoming incrassate toward margin. Leaves contorted dry, erect-spreading wet; lanceolate to ovate-ligulate, 1.0-1.6 mm long; apex obtuse to rounded; margins weakly reflexed, entire to crenulate above, bistratose; in section marginal cells rounded, smaller than rectangular laminal cells. Costa ending below apex to subpercurrent; in section flattened, cells not strongly differentiated, guide cells somewhat larger, ventral cells in single layer, thin-walled, dorsal substereid band 1-2 cells thick, cells variable in size and thickening occasionally only incrassate, dorsal surface cells similar to ventral cells. Laminal cells smooth, short-rectangular to quadrate, thin-walled; basal cells larger, rectangular, lax. Perichaetial leaves not differentiated. Seta erect, 3 mm long, yellow-brown; capsule erect, yellow-brown, urn short-cylindrical, 1.8-2.0 mm long, neck 1 mm long, strumose at base; peristome reddish yellow, teeth triangular, to 240 µm high, irregularly perforated, with vertical bars below, apical segments free, papillose, hyaline; operculum long-beaked, 0.6 mm high; calyptra cucullate; spores subreniform, 22-27 µm, papillose.