2. Erythrodontium Hampe 赤齿藓属 chi chi xian shu
Vidensk. Meddel. Dansk Naturhist. Foren. Kjøbenhavn, ser. 3, 2: 279. 1870. Entodon sect. Erythrodontium (Hampe) Müll. Hal., Linnaea 42: 433. 1879.
Plants often stiff, medium-sized to rather elongate, green, yellowish green, or brownish, somewhat glossy, in dense mats. Stems prostrate, regularly pinnately branched; branches densely foliate, distinctly julaceous. Stem and branch leaves similar, densely imbricate when dry or moist, broadly ovate or oblong-ovate, concave, abruptly acuminate or apiculate; margins plane, entire or minutely serrulate near apex; costae double, very short or absent; median leaf cells oblong-elliptical to rhomboidal, smooth; basal cells shorter; alar cells differentiated in groups, quadrate or oblate. Autoicous, rarely dioicous. Perichaetial leaves sheathing at base, narrowly lanceolate above. Setae slender, reddish or yellowish; capsules yellowish brown, erect, cylindrical; opercula long conic-rostrate; annuli not developed; peristome inserted below the mouth; exostome teeth broadly lanceolate; endostome segments linear, fragile; basal membrane low. Calyptrae cucullate. Spores papillose.