Sphagnum gedeanum Dozy & Molk., Bryol. Jav. 1: 28, t. 19. 1854. Sphagnum junghuhnianum var. semiporosum Dix., J. Bot. (London) 80: 1. 1942. Sphagnum thomsonii C. Müll., Linnaea 38: 545. 1874.

Plants rather robust, to 10 cm high, pale brown or tinged with pale purple, shiny when dry, in compact cushions. Stem cortex in (2–)3–4 layers, hyaline cells large, thin-walled, without fibrils, with a few large central pores, numerous small pores in commissural rows; central cylinder yellow, yellowish brown or reddish pink. Stem leaves ca. 1.8 mm × 0.70–0.85 mm, oblong isosceles-triangular, gradually narrowed to an involute, blunt, and dentate apex; borders narrowly and evenly differentiated to the base; hyaline cells narrowly rhomboidal, fibrillose in the upper half, rarely to the base, often divided, with numerous half-elliptic or rounded pores often in commissural rows on the dorsal surface, with a few larger, rounded pores on the ventral surface. Branches in fascicles of 4–5, with 2–3 spreading. Branch leaves 1.5–2.0 mm × 0.8–0.9 mm, large, oblong ovate-lanceolate, appressed at leaf base, reflexed or sub-squarrose in the upper part, gradually narrowed and involute to a blunt, denticulate apex; borders differentiated; hyaline cells narrowly rhomboidal, mostly with membrane pleats and somewhat fibrillose, with a few large, rounded, unringed pores near leaf base and margins on the ventral surface, with numerous half-elliptic, ringed pores in commissural rows and a few large, rounded pores in opposite pairs on the dorsal surface; green cells in cross section triangular, exposed on the ventral surface, enclosed by hyaline cells on the dorsal surface. Dioicous. Perichaetial leaves large, ovate-lanceolate; hyaline cells broadly rhomboidal, often divided, withour fibrils and pores. Spores yellowish, roughly papillose, 19–21 µm in diameter.

Type. Indonesia: Java, Junghuhn s.n.

Chinese specimens examined: FUJIAN: Wuyi Shan (Mt.), P.-C. Chen et al. 53, 854 (KUN, PE). GUANGDONG: Lu-feng Co., N.-L. Chen 42380 (PE). GUIZHOU: Duyun City, Y. Jiang 5851 (KUN, PE). HAINAN: Wuzhi Shan (Mt.), Zhongda Botany Group 17(b) (KUN, SYS). JIANGXI: Lu Shan (Mt.), P.-C. Chen 42 (KUN), Z.-G. Tun et al. 92 (KUN), M. Zang 5501 (KUN). SICHUAN: Lu-ding Co., Qing-Zang Exped. Team 7409 (KUN). TAIWAN: Jia-yi Co., Koponen 16776, 17251 (H, KUN); Tai-zhong Co., Faurie 40 (H). XIZANG: Cawalong, L.-S. Wang 1170 (KUN); Banggou, M. Zang 5139 (KUN), 5390 (KUN, MO). YUNNAN: Ping-bian Co., G.-M. Feng 4864 (KUN); Da-guan Co., X.-J. Li 4218 (KUN); Feng-qing Co., Y.-K. Yang 150 (KUN); Fu-gong Co., L.-S. Wang 82-620 (KUN); Gong-shan Co., M. -Z. Wang 10730 (PE), Q.-W. Wang 6992 (KUN), M. Zang 416, 3180 (KUN); He-qing Co., G.-M. Feng 728 (KUN, MO); Jing-dong Co., D.-Y. Xia 3 (KUN, MO), W.-X. Xu 117 (KUN), J.-K. Zhang 81-005 (KUN); Shuang-bai Co., W.-M. Zhu 6511 (KUN); Teng-chong Co., G.-H. Feng 7007 (KUN), J.-H. Pang 16 (KUN, MO); Xun-dian Co., L.-S. Wang 81-8684 (KUN); Yang-bi Co., D.-D. Tao 81003, 81004 (KUN); Yi-liang Co., X.-J. Li 4438 (KUN, MO); Zhong-dian Co., Y.-K. Yang 035 (KUN). ZHEJIANG: Ang Shan (Mt.), P.-C. Wu 383 (KUN, PE); Hangzhou City, P.-J. Qiu 16 (HSNU, KUN), S.-D. Xiang 15 (KUN).

Habitat: in bogs or on wet ground, bases of trees and rotten wood in warm, moist habitats; Distribution: China, Japan, Himalayas, India, Thailand, Vietnam, Indonesia, Malaysia, the Philippines, and New Guinea.

Illustrations: Pl. 3, figs. 1–9.