Leucobryum armatum Broth., Symb. Sin. 4: 28. 1929. Type. China: Guizhou (Kweitschou), Nandjing-schan, Handel-Mazzetti 10985 (holotype H). Leucobryum nakaii Hor., Bot. Mag. (Tokyo) 49: 217. 1935. Leucobryum salmonii Card. in Ren. & Card., Bull. Soc. Roy. Bot. Belgique 41(1): 27. 1905. Type. China: Guangdong (Kwangtung), Salmon s.n. (holotype PC) Leucobryum scaberulum Card. in Ren. & Card., Bull. Soc. Roy. Bot. Belgique 41(1): 26. 1905. Type. China: Hong Kong, Ford s.n. (holotype PC). Leucobryum scaberulum var. divaricatum Dix., Hong Kong Naturalist. Suppl. 2: 7. 1933. Type. China: Hong Kong, Herklots s.n. (holotype BM)

Plants small to large, ca. 1–5 cm high, 1 cm wide, whitish green, in soft compact tufts or in cushions. Stems erect, simple or branched; central strand absent. Leaves erect-spreading, not twisted when dry, slightly falcate-secund, 4–7 mm long, up to 1.5 mm wide, narrowly to broadly lanceolate, gradually narrowed from an oblong-ovate base to subtubulous or channelled acumina, acute to bluntly mucronate at the apex, papillosely prorate on the dorsal side of acumina; laminal cells 1–2 rows on the upper parts of leaves enclosed by a marginal border of 1–2 rows of linear cells, 4–8 rows of narrowly rectangular to linear laminal cells (30–50 µm x 5–10 µm) near leaf base; in cross section, costal leucocysts in 2–3 layers on either side of a centrally located row of chlorocyst cells. Dioicous. Sporophytes not seen. [According to Yamaguchi (1993), setae 15–16 mm long; capsules inclined, ovoid to ellipsoid, 1.3–1.6 mm × 0.6–0.9 mm.]

Type. Japan: Bonin Island, Wright s.n. (holotype FH).

Chinese specimens examined: FUJIAN: Gu Shan (Mt.), P.-J. Lin 2967 (IBSC); Wuyi Shan (Mt.), P.-J. Lin 2992 (IBSC). GUANGDONG: Baiyun Shan (Mt.) (Guangzhou), Herklots 302A (IBSC); Dinghu Shan (Mt.), P.-J. Lin & Z-.H. Li 1189 (MO), G.-L. Shi 11154 (IBSC); Xin-yi Co., Zhanjiang Exped. Team 3933 (IBSC). GUANGXI: Shang-si Co., P.-J. Lin et al. 1896, 2207 (IBSC). GUIZHOU: Fang-jing Shan (Mt.), Q.-Y. Jiao 500 (IBSC, PE); Nandjing-schan, Handel-Mazzetti 21639b (H). HAINAN: Jian-feng-ling (Mt.), P.-J. Lin 4009 (MO). HONG KONG: H. Smith s.n. 1922 (as Leucobryum subscalare, H-Brotherus). HUNAN: Mang Shan (Mt.), P.-J. Lin et al. 810, 948 (IBSC). SICHUAN: Er Mei Shan (Mt.), C. Gao 18602, 18669 (IBSC, IFSBH). TAIWAN: Bing-dong Co., S.-H. Lin s.n. [Bryophyte of Taiwan Exsiccatae 177] (MO, NICH, TUNG); Ilan Co., C.-C. Chuang 5983 (MO); Miao-li Co., S.-H. Lin s.n. [Bryophyte of Taiwan Exsiccatae 77] (MO, NICH, TUNG).

Habitat: on tree trunks and bases, and moist rocks; Distribution: China and Japan.

Illustrations: Pl. 65, figs. 7–11. Yamaguchi 1993 (Pls. XXV–XXIX).