28. Pseudochorisodontium (Broth.) C. Gao, D. Vitt, X. Fu & T. Cao, stat. nov. 无齿藓属 wu-chi xian shu
Dicranum subg. Pseudochorisodontium Broth., Nat. Pflanzenfam. (ed.2) 10: 207. 1924. Type. Dicranum gymnostomum Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 14. 1859.
Plants medium-sized to large, 4–10 cm high, coarse to fairly robust, sometimes slender, yellowish green or brownish green, shiny, in loose or dense tufts. Stems erect, simple or sparsely branched, rarely densely branched, radiculose at base; central strand present. Leaves loosely appressed, flexuose or falcate-secund when dry, erect-spreading when moist, thin and translucent, ovate-lanceolate or lanceolate, abruptly or gradually narrowed from a broadly ovate, clasping base or from an oblong-ovate or lanceolate base to a setaceous or a long, slender acumen; margins plane below or incurved above, entire or serrulate in the upper part; costa narrow, slender, subpercurrent to shortly excurrent, smooth or weakly serrulate at back above, not ridged; upper cells quadrate or rhomboidal to oblong-ellptical, smooth or papillose; basal cells elongate, rectangular or nearly so, thick-walled, porose; alar cells well differentiated, somewhat bulging out, incrassate, 2–5(–6) stratose, reddish brown. Dioicous. Perichaetial leaves strongly sheathing at base, abruptly narrowed to a short or long, subulate acumen. Setae straight, 1–3 per perichaetium, yellowish brown or reddish brown; capsules erect, cylindric, symmetric, reddish brown, not strumose; stomata absent; opercula erect, long-rostrate, nearly as long as the urns; peristome teeth absent or highly reduced. Calyptrae cucullate, entire at base. Spores spherical, smooth or minutely papillose.