17. Leiodontium Broth. in Handel-Mazzetti 平齿藓属 ping chi xian shu
Symb. Sin. 4: 127. 1929.
Plants slender, elongate, soft, yellowish green, glossy, in large mats. Stems prostrate, irregularly branched, rhizoids numerous; branches dense, short, terete, blunt at apex, ascending. Leaves densely imbricate, broadly ovate at base, abruptly acuminate or lanceolate becoming slenderly acuminate; margins slightly recurved below, serrulate throughout; costae absent, short or double; leaf cells narrowly rhomboidal, smooth, basal cells shorter; alar slightly or not differentiated. Dioicous or autoicous. Inner perichaetial leaves somewhat sheathing at base, narrowly acuminate above, serrulate at margins. Setae slender, reddish, smooth; capsules erect, ovoid, brownish, not wrinkled when dry; opercula conic, obliquely rostrate; annuli not differentiated; peristome double; exostome teeth lanceolate, yellowish, hyaline above, smooth; trabeculate on the inner surface; endostome segments linear-lanceolate, as long as the teeth, smooth, perforate; basal membrane low; cilia none. Spores yellowish, smooth.