2. Regmatodon longinervis C. Gao in C. Gao, G.-C. Zhang & T. Cao 长肋异齿藓 chang-lei yi-chi xian
Acta Bot. Yunnan. 3(4): 398. 1981. Type. China: Xizang, Yadong Co., Y.-C. Yang 1b (holotype ISFBH); Ji-long Co., S.-K. Chen 283 (paratype IFSBH).
Plants slender, rigid, yellowish green above, greenish brown below, in dense tufts. Primary stems closely creeping on substratum, lateral stems erect or ascending, 1–2times irregularly pinnately branched, flagelliform branches often present. Stem leaves lanceolate upward from broadly ovate base, 1.0–1.6 mm × 0.6–0.8 mm; branch leaves usually narrowly triangular, 1.0 mm × 0.5 mm; leaf margins plane or slightly involute, irregularly unicellarly serrulate above middle part; costa single, strong, ending below leaf apex; leaf cells thick-walled; upper cells irregularly rhomboidal, 7–12 µm × 3–4 µm, indistinctly projecting at the upper ends; several rows of cells near basal margins subquadrate; cells along costa somewhat elongated. Monoicous. Perichaetial leaves plane, smooth at apex. Setae smooth. Mature sporophytes not seen.