38. Sphagnum russowii Warnst. 广舌泥炭藓 guang-she ni-tan xian
Hedwigia 25: 225. 1886. Type. Europe.
Sphagnum acutifolium Schrad. var. robustum Russ., Arch. Naturk., Liv-Ehst-Kurlands, Ser. 2, Biol. Naturk. 7: 117. 1865, hom. illeg.
Sphagnum acutiforme Schlieph. & Warnst. var. robustum Warnst., Flora 67: 501. 1884.
Sphagnum robustum (Warnst.) Röll, Flora 69: 109. 1886.
Plants variable in size and color, stout or slender, soft, pale green or yellow, tinged with reddish color, in dense cushions. Stem cortex in 2–4 layers, hyaline cells without fibrils, with a large pore in each cell; central cylinder pale yellowish or reddish. Stem leaves 0.8–1.3 mm × 0.6–0.9 mm, variable in size, usually broadly ligulate, rounded, denticulate or somewhat lacerate at the apex; borders narrow above, suddenly widened near the base; hyaline cells rhomboidal, usually undivided, without fibrils and pores, or rarely with the traces of fibrils and small pores in the upper cells. Branches in fascicles of 4–5, with 2–3 spreading. Branch leaves 0.8–1.6 mm × 0.5–
0.9 mm, ovate-lanceolate, gradually to abruptly acuminate, reflexed near the apex when dry, blunt and denticulate at the apex; margins involute, cucullate above, borders differentiated; hyaline cells with pores at the corners in the upper cells and numerous pores here and there on the ventral surface, with elliptic pores at the opposite ends along commissural rows on the dorsal surface; green cells in cross section isosceles-triangular or trapezoidal, exposed more broadly on the ventral surface, enclosed by hyaline cells on the dorsal surface or slightly exposed on both surfaces. Dioicous
; antheridial branches purple red. Perigonial leaves
similar to vegetative branch leaves. Perichaetial leaves
broadly ovate, blunt at the apex, borders indistinct, with hyaline and green cells in the upper half, with almost only green cells in the lower half, hyaline cells without fibrils. Spores
yellowish, smooth, 21–32 µm