34. Sphagnum lenense Pohle, Trudy Glavn. Bot. Sada. 33: 14. 1915.
Sphagnum lindbergii var. microphyllum Warnstorf, Hedwigia 32: 16. 1893
Plants compact, short-branched and small; strongly reddish to golden brown, glossy when dry; flat-topped capitulum with moderately differentiated terminal bud. Stems dark brown; super-ficial cortex of 3-4 layers of enlarged thin-walled cells. Stem leaves lingulate,small, equal to or less than 0.8 mm, appressed to stem; apex with strong lacerate split in the middle; hyaline cells efibrillose, aporose, and nonseptate. Branches strongly 5-ranked, short and blunt, not much elongated at distal end. Branch fascicles with 2 spreading and 2-3 pendent branches. Branch stems green, with cortex enlarged with retort cells. Branch leaves ovate; usually less than 1.5 mm; stiff and slightly reflexed, straight to slightly subsecund; margins entire; hyaline cells moderately long and narrow (6-8:1), convex surface with one small round pore per cell at apex and numerous pseudopores on the margin, concave surface with large round wall thinnings in the cell angles and ends; chlorophyllous cells triangular in transverse section, with apex reaching concave surface. Sexual condition unknown. Spores not seen.
Common forming hummocks and carpets in a variety of weakly minerotrophic to ombrotrophic mires including Eriophorum tussock fens, dwarf shrub fens, polygon peatlands, string mires and raised bogs; low to moderate elevations; Greenland; Nfld. and Labr. (Nfld.), N.W.T., Nunavut, Que., Yukon; Alaska; Eurasia.
Sporophytes are rare in Sphagnum lenense. This species is easily distinguished from the similar S. lindbergii by its compact growth form and reddish brown color. Sphagnum lenense also is a hummock former in the tundra whereas S. lindbergii forms carpets.