1a. Leucobryum aduncum Dozy & Molk. var. aduncum 弯叶白发藓原变种 wan-ye bai-fa xian yuan bian-zhong
Pl. Jungh. 3: 319. 1854. Type. Indonesia: Java, Junghuhn s.n.
Leucobryum pentastichum Dozy & Molk., Pl. Jungh. 3: 319. 1854.
Leucobryum candidum (Brid. ex P. Beauv.) Wils. var. pentastichum (Dozy & Molk.) Dix., New Zealand Inst. Bull. 3(3): 97. 1923.
Plants small to medium-sized, 1–2 cm high, grayish to yellowish green, in dense or compact tufts. Stems erect, branched, usually not forming conical points at the apex; central strand absent. Leaves more or less in 5 rows, less than 4.5 mm long, falcate-secund, lanceolate, gradually narrowed to subtubulous tips from an ovate to elliptic base, acute at the apex, often with rhizoids, acumina channelled, filled mostly with costa, undulate and spinosely prorate on the dorsal side of the acumina; hyaline laminal cells narrowly rectangular to linear, forming borders of 1–2 rows of cells on the upper parts of leaves, 4–6 rows of cells near leaf base; in cross section, costal leucocysts 1- layered on the upper parts of leaves, 2–3-layered on the lower parts of leaves enclosing a layer of median chlorocysts throughout leaves. Dioicous. Sporophytes not seen. [According to Yamaguchi (1993), setae 16–18 mm long; capsules inclined, ovoid to ellipsoid, urns ca. 1.3 mm × 0.6 mm; other sporophyte features were reported to be the same as the genus].