13. Sphagnum girgensohnii Russ., Beitr. Torfin. 46. 1865.
Plants rather robust, stems and branches slender, stout, yellowish to grayish green, or tinged with light brownish color, in extensive compact cushions. Stem cortex in (2–)3–4 layers, hyaline cells large, thin-walled, with 2–3 large, rounded pores in each cell, without fibrils; central cylinder yellowish. Stem leaves 0.90–1.14 mm × 0.75–0.90 mm, broadly ligulate to oblong-ligulate, broadly rounded-truncate and lacerate-fringed at the apex; borders narrow above, suddenly widened below the middle (ca. 1/3 the leaf width at base); hyaline cells broadly to narrowly rhomboidal from the upper to lower, sometimes divided, without fibrils and pores, with a sieve-like triangular area of resorption at the middle of leaf base. Branches in fascicles of 3–5, with 2–3 spreading, gradually tapering or curved, sometimes short and abruptly tapering, capitulum in 5 radiate rows. Branch leaves 1.0–1.3 mm × 0.50–0.75 mm, imbricate, ovate-lanceolate, erect-spreading when dry; hyaline cells often with pseudofibrillose division, with large, rounded, unringed, central pores on the ventral surface, with small, ringed pores at the corners, rarely with commissural pores in the lower cells on the dorsal surface; green cells in cross section trapezoidal, often exposed on both surfaces, more broadly so on the ventral surface. Dioicous or monoicous; antheridial branches pale brown; perigonial buds globose. Perigonial leaves small, short and broad. Perichaetial leaves large, oblong or ovate-ligulate. Spores yellowish brown, smooth, 30–33 µm in diameter.
Chinese specimens examined: GUIZHOU: Ying-jiang Co., J.-X. Jiang 56(b) (KUN). HEILONGJIANG: Hong Xing, H.-F. Xie 2 (KUN); Xiao Xing An Ling (Lesser Khingan Mt.), P.-C. Chen 320, 1260 (KUN, PE), C. Gao 126, 18671 (IFSBH, KUN), Y-C. Zhu 48 (KUN). JILIN: Changbai Shan (Mt.), S.-E. Liu 1550 (IFSBH, KUN); Yalujiang (river), C. Gao 144, 7309 (IFSBH, KUN), S.-E. Liu 7473, 8896 (IFSBH, KUN), Z.-G. Wang 2552 (KUN). NEI MONGOL: Da Xing An Ling (Greater Khingan Mt.), P.-C. Chen 835 (KUN, MO, PE), 1030 (KUN), X.-Y. Fu 2317 (KUN), C.-Q. Lin 2058 (KUN), H.-F. Xie 7, 42 (KUN); Genhe, C. Gao 24, 1030 (IFSBH, KUN). SHAANXI: Q. Huang 1623 (KUN). SICHUAN: Omei Shan (Mt.), P.-C. Chen 1 (KUN), D.-K. Li 15468, 16058 (KUN, SHM), C. Gao & S.-Z. Wang 40001, 40076 (IFSBH, MO), Q. Li 2354, 2397 (KUN), J.-X. Luo 392, 397 (KUN, PE); between Leshan and Omei, M. Zang 2402 (KUN), 4684 (KUN, MO); Lu-ding Co., Y. Xuan 82002 (KUN, MO); Maerkang Co., X.-J. Li 1231 (KUN); Shi-mian Co., Q. Li 6273 (KUN); Tian-quan Co., Z.-L. Wu 11760 (KUN); Wen-chuan Co., Y. Xuan 82005 (KUN); Xiang-cheng Co., W.-H. Li 81-2036 (KUN); Xiao-jing Co., J. Zhou 284 (KUN); Xi-kang Co., X.-Y. Hu 2688 (KUN). XIZANG: Mi-lin Co., Y.-G. Su 5029, 5266 (KUN); Mo-tou Co., Y.-G. Su 1063 (KUN, MO); Ri-dong Co., M. Zang 5141, 5248 (KUN); Ya-dong Co., M. Zang 551 (KUN). YUNNAN: between Nujiang (river) and Lancangjiang (river), Handel-Mazzetti 8422 (H); Gong-shan Co., M. Zang 600 (KUN, MO); between Gongshan and Fugong, D.-C. Zhang 562 (KUN); Li-jiang Co., G.-M. Feng 9446 (KUN); Wei-xi Co., L.-S. Wang 372, 715 (KUN); Yang-bi Co., W.-M. Zhu 636, 637 (KUN); Yi-liang Co., X.-J. Li 4423, 4465 (KUN); Zhao-tong Pref., C.-X. Li 7311 (KUN), Y. Zhao 8501 (KUN).
Habitat: in various kinds of habitats, often on wet depressions in swamps, humic soil under coniferous forests or on humic soil under Rhododendron and bamboo, sometimes on wet rocks near streams, forming large, loose carpets; Distribution: China, Nepal, India, Indonesia, Korea, Japan, Russia, Caucasus, Europe, Greenland, and North America.
This species is characterized by having grayish plants with stout stems and branches and by having imbricate branch leaves and broadly ligulate stem leaves with marginal borders suddenly widened at base.
Illustrations: C. Gao (ed.) 1994 (Pl. 5, figs. 6–14).