38. Brachythecium thraustum Müll. Hal. 脆枝青藓 cui zhi qing xian
Nuovo Giorn. Bot. Ital., n.s., 4: 270. 1897. Type: China. Shaanxi, March 1896, Giraldi s.n.
Plants medium-sized, soft, slender, green or yellowish green, in loose mats. Stems prostrate, to 3–4 cm long, regularly pinnately branched, densely foliate; branches blunt at apex. Stem leaves broadly ovate-lanceolate, 1.29–1.85 mm × 0.51–0.90 mm, irregularly plicate, gradually or rather abruptly narrowed to a slender apex; margins entire below, serrulate above; costae reaching 2/3–3/4 the leaf leangth; median leaf cells linear, 45–67 µm × 6–7 µm, with rounded ends; basal cells shorter; alar cells differentiated, quadrate, shortly rectangular or hexagonal, extending close to costa at leaf base, thin-walled; branch leaves narrowly ovate-lanceolate, 1.31–1.47 mm × 0.41–0.46 mm; margins serrulate above; costae slender, ending in leaf acumen. Sporophytes not seen.