4. Ditrichum flexicaule (Schwaegr.) Hampe 细牛毛藓 xi niu-mao xian
Flora 50: 182. 1867. Cynodontium flexicaule Schwaegr., Sp. Musc. Frond., Suppl. 1(1): 113. 1811. Type.
Switzerland: Schleicher s.n.
Plants medium-sized, 2–3 cm high, green or yellowish green, in loose tufts. Stems erect, simple or dichotomously branched, sparsely radiculose at base. Leaves 2.5–3.6 mm long, contorted when dry, erect-patent when moist, lanceolate, abruptly narrowed from an oblong-ovate base to a slender, somewhat canaliculate acumen; margins plane, entire nearly throughout; costa shortly excurrent; upper leaf cells rounded quadrate to short-rectangular, lower cells short-rectangular to rectangular, 6–8 µm × 10–13 µm, juxtacostal cells more elongate, 6–8 µm × 13–26 µm, thin-walled, shoulder cells rounded-quadrate, 7–8 µm × 8–13 µm, becoming thick-walled; sometimes with 2–3 rows of linear, pellucid cells at the basal margins. Dioicous. Sporophytes not seen.