4. Sphagnum capillifolium (Ehrh.) Hedw. 尖叶泥炭藓 jian-ye ni-tan xian
Fund. Hist. Nat. Musc. Frond. 2: 86. 1782. Sphagnum palustre ssp. capillifolium Ehrh., Hannovr. Mag. 18: 235. 1780. Type. Europe.
Sphagnum acutifolium Ehrh. ex Schrad., Spic. Fl. Germ. 58. 1794.
Sphagnum nemoreum Scop., Fl. Carniol., ed. 2, 305. 1772.
Plants variable in size and color, usually green to yellowish brown, somewhat tinged with pinkish color, sometimes distinctly reddish, not shiny when dry, in loosely compact tufts. Stem cortex in 2–4 layers, hyaline cells thin-walled, without fibrils and pores; central cylinder yellowish or light reddish. Stem leaves differentiated in size on the same stem, generally larger in the lower parts and smaller in the upper parts of the stems, 1.0–1.5 mm × 0.4–0.7 mm, oblong-ovate to oblong-isosceles-triangular, upper margins involute to a nearly cucullate apex; borders narrow above, clearly widened below; hyaline cells broad-rhomboidal in the upper parts of leaves, mostly divided, narrow-rhomboidal below, less divided, with large pores on both surfaces. Branches in fascicles of 3–5, with 2–3 spreading. Branch leaves 0.9–1.4 mm × 0.4–0.5 mm, ovate-lanceolate, upper margins involute, with blunt, dentate apex; hyaline cells densely fibrillose, upper cells with pores at ends and at corners, lower cells and marginal cells with large pores on ventral surface, with numerous, ringed, elliptic pores in the upper cells, gradually enlarged in the lower cells on the dorsal surface; green cells in cross section triangular, exposed on the ventral surface. Dioicous or monoicous; branches with antheridia reddish; perigonial leaves short and broad with abruptly narrowed apex. Perichaetial leaves broadly ovate, abruptly involute-concave at the apex. Spores pale-yellowish, smooth or slightly papillose, 20–25 µm in diameter.