1. Schistidium apocarpum (Hedw.) Bruch & Schimp. in B.S.G. 圆蒴连轴藓 yuan-shuo lian-zhou xian
Bryol. Eur. 3: 99. tab. 233. (fasc. 25–28). 1845. Weissia apocapra (Hedw.) Poiret, Encycl. 8: 794. 1808. Grimmia apocarpa Hedw., Sp. Musc. Frond. 76. 1801. Type. “Lipsiae ad piscinam Lindenthalensem, Gothanam versus Deburgum, Dresdae ad rivulum Weiseriz ubertum” (lectotype G, designated by T. Cao & Vitt 1986).
Plants medium-sized, up to 2.0–3.5 cm high, green above, dark green to blackish or dark brown below, in dense tufts. Stems erect, fairly freely branched, with well developed central strand in cross section. Leaves erect, imbricately appressed when dry, spreading when moist, keeled above, 1.5–2.3 mm long, lanceolate from an ovate base, gradually narrowed to a short hyaline hair-point (0.20–0.45 mm long); margins entire, recurved on one or both sides nearly throughout, bistratose above; costa prominent, ending just below the apex, smooth on abaxial surface, consisting of nearly uniform cells in cross section; upper cells irregularly rounded-quadrate, 5–7 µm wide, unistratose or in places bistratose; basal marginal cells quadrate to short-rectangular, 9–14 µm × 7–12 µm, with slightly sinuose walls; basal juxtacostal cells short-rectangular to rectangular, 14–23 µm × 5–7 µm, with nearly straight walls. Autoicous. Perichaetial leaves enlarged, up to 2.8 mm long, broadly ovate, erect. Setae shorter than capsule urns, yellowish green, straight, 0.3–0.4 mm long; capsules immersed, erect, 1.2–1.5 mm long, oblong to oblong-ovoid, wide mouthed, smooth or nearly so; exothecial cells quadrate to oblate, with thin and smooth walls; annuli absent; opercula conic with a short, obtuse beak; columella falling with operculum; peristome teeth reddish brown, lanceolate, perforate above, papillose throughout on outer and inner surfaces. Calyptrae small, cucullate. Spores 7–11 µm in diameter, small, yellowish green, granulose to nearly smooth.