9. Desmatodon thomsonii (C. Müll.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1871–72:406. 1873; Trichostomum thomsonii C. Müll., Bot. Zeitung (Berlin) 22: 359. 1864.
汤氏链齿藓
Tortula thomsonii (C. Müll.) Zand., Bull. Buffalo Soc. Nat. Sci. 32: 226. 1993.
Plants in dense tufts. Stems mostly branched, radiculose at the base. Leaves oblong-ovate to elliptic-ligulate, rounded at the apex, occasionally with minute apiculus; margins entire, usually revolute, border distinctly differentiated in 3–4 rows of narrowly rectangular to linear cells, yellowish; costa slender, ending a few cells below the apex; upper leaf cells quadrate to hexagonal, with numerous C-shaped or circular papillae; basal cells rectangular, smooth, hyaline, or sometimes with minute rounded papillae. Setae slender, curved; capsules ovoid-cylindrical, horizontal to inclined.
Type. China: western Xizang, T. Thomson 278.
Specimen examined: SICHUAN: Wen-chuan Co., D.-Z. Xie 238 (HKAS).
Habitat: on rocks in high mountains; Distribution: endemic to China.
Illustrations: Pl. 116, figs. 5–8.
