7. Hypnum fertileSendt. 多蒴灰藓 duo shuo hui xian
Denkschr. Bayer. Bot. Ges. Regensburg 3: 147. 1841. Sanionia fertilis (Sendt.) Loesk., Hedwigia 46: 309. 1907. Type: Europe.
Hypnum pseudo-circinale Kindb., Ottawa Naturalist 14: 83. 1900.
Plants medium-sized, soft, flattened, yellowish green or yellowish brown, somewhat glossy, in interwoven mats. Stems prostrate, up to 10 cm long, subpinnately branched, branches short; pseudoparaphyllia narrowly lanceolate; in stem cross section epidermal cells inflated, thin-walled. Stem leaves densely foliate, falcate-secund, 1.5–2.0 mm × 0.7–0.8 mm, broadly elliptical-lanceolate to ovate-lanceolate, not decurrent at base, somewhat concave, not or only slightly plicate, slenderly acuminate; margins slightly revolute, entire below, serrulate near the apex; costae double, short or absent; median leaf cells linear, 39–64 µm × 2–3 µm, basal cells short, porose, yellowish; alar cells differentiated, quadrate or oblong, often consisting of a few excavate, hyaline, thin-walled cells; branch leaves similar to stem leaves in shape, smaller. Autoicous. Perichaetial leaves erect, filiform-acuminate, plicate. Setae 1.0–2.0 cm long, reddish brown, twisted when dry; capsules suberect or horizontal, cylindrical, 1.5–2.0 mm long; opercula conic; annuli revoluble; peristome typically hypnoid, with 2–3 cilia. Calyptrae not seen. Spores 10–13 µm in diameter, yellowish brown, minutely papillose.