39. Sphagnum sericeum C. Müll. 丝光泥炭藓 si-guang ni-tan xian
Bot. Zeit. 5: 481. 1847. Type. Indonesia: Sumatra, Junghuhn s.n.
Sphagnum holleanum Dozy & Molk., Natuurk. Verh. Kon. Akad. Wetensch. Amsterdam 2: 6. 1854.
Sphagnum seriolum C. Müll., Flora 70: 421. 1887.
bright green, tinged with yellow, silky lustre when dry. Stem cortex
in 2–3 layers, hyaline cells thick-walled, yellowish, outer walls without pores, inner walls sometimes with small pores; central cylinder deep yellowish, stout. Stem leaves
ca. 1.1 mm × 0.7 mm, nearly isosceles-triangular, acuminate and often apiculate at the apex, margins bordered by linear cells, evenly differentiated throughout; hyaline cells linear-rhomboidal, often 1–2 divided, without fibrils, with pores at the upper ends on the dorsal surface. Branches
in fascicles of 5–6, with
2–3 spreading, slender, soft, or drooping, ca. 3 cm long. Branch leaves 1.0–1.4 mm × 0.4–0.5 mm, erect-spreading, loosely imbricate, ovate, concave, abruptly acuminate, sharp-pointed, margins involute, serrate, borders narrowly differentiated; hyaline cells larger near the base, smaller in the upper half, sometimes divided, without fibrils, nearly all green cells near the apex, with a single, rather large pore at the upper corner in each cell on the dorsal surface; green cells in cross section trapezoidal, tinged with yellowish, thick-walled, exposed more broadly on the ventral surface, also slightly exposed on the dorsal surface. Monoicous. Sporophytes not seen.