Hydrogonium consanguineum (Thwait. & Mitt.) Hilp., Beih. Bot. Centralbl. 50(2): 626. 1933. Tortula consanguinea Thwait. & Mitt., J. Linn. Soc., Bot. 13: 300. 1873. Hydrogonium javanicum var. convolutifolium (Dix.) P.-C. Chen, Hedwigia 80: 244. 1941. Barbula convolutifolia Dix., Hong Kong Naturalist, Suppl. 2: 10. 1933. Type. China: Hong Kong, Herklots 249b.

Plants small, 5–10 mm high, yellowish green, in dense tufts. Stems erect, short, usually branched. Leaves appressed or imbricate when dry, erect-spreading when moist, ovate-ligulate; margins entire, plane in the lower half, serrulate, somewhat concave or cucullate in the upper half; costa stout, percurrent; upper leaf cells irregularly quadrate to hexagonal, thick-walled, mostly smooth, occasionally mammillose.

Type. Indonesia: Java.

Chinese specimens examined: ANHUI: Yi Co., M. Zang 5701 (HKAS). HAINAN: Bai-po, Z. He 1135 (PE); Jian-feng-ling (Mt.), P.-C. Chen 24, 29 (PE). HENAN: Xin-yang Co., Gui Shan (Mt.), Z.-Z. He 38 (MO, PE); Ji-gong Shan (Mt.), J.-X. Luo 10 (PE). JIANGSU: Li-yang Co., D.-K. Li 18951 (HKAS, SHM). XIZANG: Ding-qing, M. Zang 5341b (HKAS). YUNNAN: Jing-hong Co., Redfearn et al. 33738 (MO); Lu-xi Co., X.-J. Li 82 (HKAS); Meng-hai Co., Redfearn et al. 34114 (MO); Rui-li Co., X.-J. Li 166 (HKAS).

Habitat: on rocks or soil in moist places; Distribution: China, Nepal, Pakistan, India, Myanmar, Indonesia, and Sri Lanka.

Illustrations: Pl. 125, figs. 5–9.