44. Sphagnum teres (Schimp.) Ångstr. in Hartm., Handb. Skand. Fl., ed. 8. 417. 1861; Sphagnum squarrosum var. teres Schimp., Versuch Etwickl. Torfm. 64. 1858.
Sphagnum squarrosum ssp. teres (Schimp.) Ångstr. in C. Hartm., Handb. Skand. Fl. (ed. 8), 417. 1861.
Plants rather slender, yellowish green or brown, in loose carpets. Stem cortex in 3–4 layers, hyaline cells thin-walled, without fibrils or pores, sometimes with a single pore, without fibrils; central cylinder yellowish or reddish brown. Stem leaves 1.3–1.4 mm × ca. 1 mm, ligulate, rounded obtuse, dentate or lacerate at the apex; borders hyaline, cells indistinctly differentiated; hyaline cells usually undivided, without fibrils and pores, or rarely with the traces of fibrils and membrane gaps. Branches in fascicles of 5, with 2–3 spreading. Branch leaves 1.2–1.6 mm × 0.6–1.0 mm, ovate-lanceolate, gradually narrowed to a sharp acumen, reflexed in the upper part, margins involute; hyaline cells rhomboidal, fibrillose, with large, ringed pores at the corners of upper cells, gradually positioned along commissural rows in the lower cells on the ventral surface; with a few large, non-ringed pores at the upper corners, gradually becoming numerous rounded, ringed pores near the base on the dorsal surface; inner walls adjacent to green cells often faintly papillose; green cells in cross section trapezoidal, exposed more broadly on the dorsal surface, slightly exposed or largely enclosed by hyaline cells on the ventral surface. Dioicous. Perigonial leaves similar to vegetative branch leaves. Perichaetial leaves oblong-ligulate, 4.0–5.0 mm × 2.0 mm. Spores grayish brown, papillose, ca. 25 µm in diameter.
Chinese specimens examined: HEILONGJIANG: Xiao Xing An Ling (Lesser Khingan Mt.), C. Gao 396, 620 (IFSBH, MO), 402, 575 (IFSBH, KUN), S.-E. Liu 845, 1450 (IFSBH, KUN), Y.-L. Zhang 55, 64 (IFSBH, KUN); Yichuan City, G.-X. Li 31(b) (KUN). JILIN: Changbai Shan (Mt.), J.-F. Chen 6794 (KUN), 8786 (KUN, MO), C. Gao 1200, 6785 (IFSBH, KUN), K.-C. Lang 36(a) (KUN); Dun-hua Co., Y.-L. Zhang 1124 (KUN). LIAONING: Changbai Shan (Mt.), C. Gao 990, 1008 (KUN), L.-F. Han 589 (KUN), K.-C. Lang 3 (KUN), Y.-C. Zhu 282 (KUN). NEI MONGOL: Da Xing An Ling (Greater Khingan Mt.), C. Gao 834 (IFSBH, KUN, MO), D.-Z. Wang 150, 325 (KUN, PE), H.-F. Xie 28, 79 (KUN). SHAANXI: Taibai Shan (Mt.), S.-E. Liu 1013, 4226 (KUN), Z.-P. Wei 5610, 5845 (IWH, KUN), 5853 (IWH, KUN, MO), Z.-C. Zhu 6, 51 (KUN). SICHUAN: Emei Shan (Mt.), C.-H. Gao 15800 (KUN, SHM). XIZANG: Cha-yu Co., J.-X. Xi 793 (KUN, MO); Mo-tou Co., Y.-G. Su 2489 (KUN). YUNNAN: Fu-gong Co., L.-S. Wang 515 (KUN, MO); Gong-shan Co., M.-Z. Wang 10673 (KUN, PE), M. Zang 532, 906 (KUN), D.-C. Zhang 4063 (KUN); Jing-dong Co., W.-X. Xu 544 (KUN).
Habitat: on humic soil under forests; also in bogs, at the margins of forests or near streams; Distribution: China, India, Japan, Russia (Siberia and Caucasus), Europe, Greenland, and North America.
Illustrations: C. Gao (ed.) 1994 (Pl. 21, figs. 10–13).