5. Polytrichum strictum Menz. ex Brid. 直叶金发藓 zhi ye jin fa xian
J. Bot. (Schrader) 1800(1): 286. 1801. Polytrichum juniperinum var. strictum (Brid.) Roehl., Deutschl. Fl. (ed. 2), Kryptog. Gew. 3: 58. 1813, nom. illeg. Polytrichum juniperinum subsp. strictum (Brid.) Nyl. & Sael, Herb. Mus. Fenn. 65. 1859. Type: Europe.
Polytrichum juniperinum var. gracilius Wahlenb., Fl. Lapp. 344. 1812.
Plants small to large. Stems simple, often branched, 2–7(–12) cm high, erect or slightly patent when dry, 1–3 mm wide with leaves; numerous rhizoids at base or lower stems, sometimes on stem apex. Leaves 2.0–2.5 mm long, lanceolate from a sheathing base; leaf margins entire, involute above, covering ventral lamellae, sometimes hyaline at sheathing base; costa strong, excurrent, usually not forming a filiform acumen; ventral lamellae in 21–28 rows, 6–8 cells high; marginal cells of lamellae, thick-walled, pyriform, lumen small, slightly wider than the lower ones; median cells oblate-ovate or irregularly oblate, 9–12 µm × 30–45 µm, thick-walled; cells at sheathing base narrowly rectangular, 45–85 µm × 7–12 µm. Dioicous. Setae slender, 1.8–4.1 cm long; capsules obtusely 4-keeled, 2.5–3.2 mm × 1.0–1.3 mm, apophyses differentiated; opercula with rather long beak; annuli differentiated; peristome teeth 64, 150–180 µm long, membrane thin. Spores spherical, 7–15 µm in diameter, verrucose.