9. Regmatodon Brid. 异齿藓属 yi-chi xian shu
Bryol. Univ. 2: 294. 1827.
Plants rigid when dry, dull or slightly shiny, green to yellowish green, in sparse to dense mats. Stems creeping, irregularly or pinnately branched; branches short, sometimes flagelliform, obtuse at tips; paraphyllia rare or lacking. Stem leaves small, mucronate; branch leaves imbricate when dry, erect-spreading when wet, oblong-ovate or ovate-lanceolate, slightly concave, recurved at apex; margins entire or sparsely dentate above; costa single, reaching middle part of leaf or slightly above; leaf cells thick-walled, rhomboidal; alar cells undifferentiated; several rows of basal cells near margins smaller, subquadrate. Monoicous. Inner perichaetial leaves erect, elongate, acuminate. Setae elongate, reddish brown, smooth or coarsely papillose; capsules erect to slightly pendent, ovoid to cylindrical; peristome double; exostome obviously shorter than endostome, the teeth shortly lanceolate, slightly blunt at tips, yellowish, smooth, transversely striate; endostome segments yellowish, smooth or papillose, 2–3 times longer than the teeth, acuminate, keeled, perforate at middle; basal membrane low; opercula conic, with obtuse tips. Spores spherical, coarsely papillose.