Trichostomum involutum Broth., Akad. Wiss. Wien Sitzungsber., Math.-Naturwiss. Kl., Abt. 1, 131: 210. 1923, hom. illeg.

Plants small, 10–15 mm high, yellowish green to light brown, in dense tufts. Stems erect, simple or irregularly branched, densely foliate. Leaves strongly crisped when dry, erecto-patent when moist, fragile, linear-lanceolate, ca. 5 mm long, acuminate or setaceous, weakly sheathing at base; margins entire, strongly incurved in the upper half; costa stout, excurrent as an apiculus; upper leaf cells rounded-quadrate, moderately thick-walled, green and obscure, each cell with several large, circular papillae on both surfaces; basal cells slightly elongate, irregularly short-rectangular, smooth, yellowish or hyaline. Sporophytes not seen.

Type. China: Guizhou (Kweitschow), Li-ping, Handel-Mazzetti 10994 (holotype H).

Specimens examined: FUJIAN: Wuyi Shan (Mt.), D.-K. Li 11394 (HKAS, SHM). GUANGDONG: Ding-hu Shan (Mt.), H. Wu 16 (PE); Lian Co., L. Zhang 793 (HKAS); Yang-shan Co., G.-Q. Zeng 264 (HKAS). HENAN: Hui Co., Feng-huang Shan (Mt.), D.-Z. Tu 1596 (PE). JIANGXI: Lu Shan (Mt.), X.-J. Li 289 (PE). NINGXIA: Niu-shu Shan (Mt.), S.-L. Liu 15 (PE). SHANGHAI: Xi-jiao Park, S.-M. Xu 376 (PE). TAIWAN: Tien-hsiang, Iwatsuki & Sharp 3528 (NICH). YUNNAN: Bi-luo-xue Shan (Mt.), S.-G. Wu 25 (PE).

Habitat: on forest ground, rocks, or soil walls; Distribution: endemic to China.

Illustrations: Pl. 134, figs. 1–6.