8. Dicranella heteromalla (Hedw.) Schimp. 多形小曲尾藓 duo-xing xiao qu-wei xian
Coroll. Bryol. Eur. 13. 1856. Dicranum heteromallum Hedw., Sp. Musc. Frond. 128. 1801. Type. Europe.
Plants small to medium-sized, 1–3(–4) cm high, yellowish to dark green, in rather shiny, loose tufts. Stems erect, simple or branched. Leaves 2–3 mm long, lower leaves smaller, upper leaves larger, erect to falcate-secund, oblong-lanceolate, gradually narrowed to a subulate acumen; margins plane, entire below, serrulate above the middle; costa shortly excurrent, filling most of the acumen, occupying ca. 1/3 leaf base width; upper cells short-rectangular, 7–10 µm × 4–6 µm; lower cells slightly shorter. Dioicous. Perichaetial leaves rather abruptly narrowed from a somewhat sheathing base. Setae straight, 8–15 mm long, yellowish brown, becoming dark reddish when old; capsules inclined to horizontal, short-cylindric, ca. 1.5 mm long, slightly curved, smooth and contracted below the mouth when dry; exothecial cells prosenchymatous; opercula obliquely long-rostrate, ca. 1 mm long; annuli poorly differentiated, consisting of only 1 row of small cells; peristome teeth ca. 500 µm long, divided about 1/3–1/2 down to the base, reddish brown. Spores 14–18 µm in diameter, finely papillose.