Plants stout, robust, whitish green tinged with brownish, in dense tufts, shiny when dry. Stem cortex in 2–3 layers, hyaline cells narrow, thin-walled, without fibrils; central cylinder not clearly differentiated. Stem leaves 0.7–1.6 mm × 0.5–0.9 mm, oblong-ligulate or triangular-ligulate, sometimes the basal width wider than length, narrowly obtuse to acute, at times lacerated at the apex, borders narrow, evenly differentiated; hyaline cells divided, rather short and broad, without fibrils and pores, occasionally with one or two large, central pores on the ventral surface. Branches in fascicles of 4–6, with 2–3 spreading, often slender and curved at the apex. Branch leaves usually in 5 rows, 0.8–1.3 mm × 0.3–0.6 mm, ovate-lanceolate, gradually narrowed to a chanelled apex, margins involute, often undulate when dry; hyaline cells densely fibrillose, with numerous large pores at the corners on the ventral surface, with small, ringed pores at the cell angles on the dorsal surface, the inner walls adjacent to green cells smooth; the green cells in cross section triangular, exposed on the dorsal surface. Dioicous. Sporophytes not seen.
Sphagnum rufulum C. Müll., Linnaea
38: 549. 1874.