7. Polytrichastrum sexangulare Flörke ex Brid. 长栉拟金发藓 chang zhi ni jin fa xian
Mem. New York Bot. Gard. 21(3): 37. 1971. Polytrichum sexangulare Flörke ex Brid., J. Bot. (Schrader) 1800(1): 285. 1801. Type: Europe.
Polytrichastrum norwegicum (Hedw.) Schljakov, Novosti Sist. Nizsh. Rast. 19: 210. 1982. Polytrichum norwegicum, auct. mult. non Hedw., Sp. Musc. Frond. 99. Pl. 22: f. 1–5. 1801.
Plants small to medium-sized, 1–5 cm high, 2.5–3.0 mm wide with leaves. Leaves lanceolate above, gradually narrowed from a concave, rounded ovate sheathing base, slightly clasping, 3.0–4.7 mm × 1.0–1.2 mm; leaf margins strongly incurved and entire; costa broad, percurrent, not forming a piliform acumen, with a few spines on back above; median leaf cells oblate-ovate to oblate-hexagonal, 40–50 µm × 10–15 µm, rather thin-walled; cells at sheathing base narrowly rectangular, 25–60 µm × 5–10 µm; ventral lamellae in 25–30 rows, 5–8 cells high, apical cells of lamellae pyriform, slightly wider than the lower cells. Dioicous. Setae slender, 1.2–2.0 cm long; capsules 3–4 mm long, with 5–6 keels, apophyses slightly differentiated; opercula long beaked; peristome teeth usually 64. Calyptrae cucullate, densely covered with golden hairs. Spores spherical, 13–16 µm in diameter, verrucose.