1. Iwatsukiella leucotricha (Mitt.) Buck & Crum 小柔齿藓 xiao rou-chi xian
J. Hattori Bot. Lab. 44: 352. 1978. Habrodon leucotrichus (Mitt.) Perss., Svensk, Bot. Tidskr. 40: 319. 1946. Heterocladium leucotrichum Mitt., Trans. Linn. Soc. London, Bot. 3: 176. 1891. Type. Japan: Tochigi Pref., Mt. Nantaizan, Bisset s.n.
Habrodon piliferus Card., Bull. Soc. Bot. Genève, ser. 2, 3: 280. 1911.
Plants slender, green, slightly glossy, irregularly procumbent. Main stems closely attached on substrata, irregularly pinnately branched, branches short and densely covered with leaves; rhizoids sparse; pseudoparaphyllia numerous, foliose; central strand not differentiated. Leaves reflexed when moist, imbricate when dry, rounded or rounded ovate at base, not decurrent, abruptly narrowed to a multi-cellular, piliferous apex, straight or curved; leaf margins entire; costa absent or inconspicuous forked; leaf cells elliptic, somewhat thick-walled; alar cells not clearly differentiated. Dioicous. Inner perichaetial leaves erect, not sheathing at base, gradually narrowed to a slender apex; margins serrulate. Setae 5–7 mm long, slender, purple red or reddish brown, twisted when dry; capsules erect, symmetrical, oblong-ellipsoid, apophysis short, mouth broad, not constricted when dry; exothecial cells thin-walled; opercula shortly cylindrical, obtuse; annuli 1–2(3–4) rows of cells; peristome double; exostome teeth lanceolate, smooth or finely striate below, papillose above; endostome segments linear; basal membrane low. Calyptrae cucullate. Spores tiny.