中位泥炭藓

Sphagnum medium Limpr., Bot. Centralbl. 7: 313. 1881.

Plants rather robust, stout, pale yellowish green to yellowish brown, young branch tips often tinged with purple, in loose or compact tufts. Stem cortex in 3–5 layers, hyaline cells large, fibrillose, each with 1–4 large, rounded pores; central cylinder pinkish or reddish brown. Stem leaves 1.0–2.0 mm × 0.7–0.8 mm, lingulate, broadened at the apex, borders hyaline and differentiated, often involute; hyaline cells undivided, densely fibrillose, with many pores at the opposite ends in the upper half of the leaves, in the lower half fibrils indistinct, with large, central pores. Branches in fascicles of 4–5, with 2–3 spreading, hyaline cells with fibrils and pores. Branch leaves 1.4–2.0 mm × 1.1–1.3 mm, rounded ovate, imbricate, deeply cucullate-concave, dorsally roughened and rounded at the apex; hyaline cells with large, rounded pores on the ventral surface, mostly with ringed pores at the opposite ends on the dorsal surface; green cells in cross section elliptic, centrally located, entirely enclosed by large, hyaline cells on both surfaces. Dioicous; antheridial branches purple red; perigonial leaves large, broadly ovate. Spores pinkish, densely papillose, 24–28 µm in diameter.

Type. Chile: Tierra del Fuego.

Chinese specimens examined: ANHUI: Huang Shan (Mt.), M. Zang 20 (KUN). GUIZHOU: Ying-jiang Co., J.-X. Jiang 56a (KUN). HEILONGJIANG: Da Xing An Ling (Greater Khingan Mt.), C. Gao 12735 (KUN, MO), H.-F. Xie 16 (KUN). HUNAN: Wu-gang Co., G.-Z. He 284 (PE). JILIN: Changbai Shan (Mt.), Z.-Y. Wu 1118 (KUN), Yuanchi (Lake), Vitt 34805 (ALTA, MO); Jing-yu Co., S.-E. Liu 8851 (KUN), S.-E. Liu 1118 (IFSBH, MO); Man-jiang Co., K.-C. Lang 65 (KUN). LIAONING: Liao-dong Pref., C. Gao 118a, 199 (IFSBH, KUN). NEI MONGOL: Da Xing An Ling (Greater Khingan Mt.), S.-E. Liu 3 (KUN). SICHUAN: Lu-ding Co., Y. Xuan 82004 (KUN, MO). YUNNAN: Gong-shan Co., Q.-W. Wang 33783, 33799 (KUN); Jing-dong Co., W.-X. Xu 78, 115 (KUN, YUKU).

Habitat: in peatland or on wet ground under coniferous forests, or on wet soil under Rhododendron brush; Distribution: China, Himalayas, India, Indonesia, Russia (Siberia), Europe, North, Central, and South America, and Africa.

Illustrations: C. Gao (ed.) 1994 (Pl. 9, figs. 1–10).