Sphagnum capillifolium
Sphagnum russowii
common red peat-moss, small red peat moss, sphagnum
Russow's peat-moss, Russow's sphagnum
green to red;
superficial cortical cells aporose Stem leaves lingulate-triangular, 1.2–1.6(–1.8) mm, apex ± involute;
border entire and broadened to about 0.25 the width of the base;
hyaline cells S-shaped, 0–1-septate, usually fibrillose in distal portion of leaf.
leaves lingulate, 1.3–1.6 mm, apex broadly rounded or pointed and notched (sometimes denticulate), border strong and broadened at base (more than 0.25 width);
hyaline cells short sinuoid-rhombic, mostly efibrillose, 0–1(–2)-septate.
not 5-ranked, terete.
long and slender, never 5-ranked.
ovate-lanceolate, 1–1.4 mm, imbricate to moderately spreading, concave, straight, strongly involute near apex;
hyaline cells on convex surface with elliptic pores along commissures, concave surface with large round pores away from commissures in proximal portions of leaf.
ovate-lanceolate, 1.3–1.6 mm, concave, straight, apex strongly involute;
hyaline cells on convex surface with numerous round to elliptic pores along the commissures, grading from small round pores near the apex to large elliptic pores at the base, concave surface usually with large round pores throughout, but sometimes restricted to proximal portions of leaf.
dioicous.
dioicous, but some specimens apparently monoicous.
20–28 µm; finely papillose on both surfaces, with distinct raised Y-shaped sculpture on distal surface;
proximal laesura 0.5 spore radius or more.
18–33 µm, coarsely papillose on both surfaces;
proximal laesura more than 0.5 spore radius.
fascicles with 2 spreading and 1–2 pendent branches.
fascicles with 2 spreading and 1–2 pendent branches.
Sphagnum capillifolium
Sphagnum russowii
Sporophytes are fairly common in Sphagnum capillifolium. This species is most common and abundant in ombrotrophic heath vegetation associated with S. angustifolium, S. fallax, S. fuscum, S. magellanicum, S. rubellum, Polytrichum commune, and P. juniperinum. It can be distinguished from most other red species of sect. Acutifolia with which it co-occurs by its lack of 5-ranking in the branches. Sphagnum subtile is a forest and non-hummock forming species that has a distinctly shorter and more triangular-lingulate stem leaf. The stem leaf border on S. subtile is also more strongly bordered. Sphagnum tenerum, which geographically overlaps S. capillifolium only very minimally, has much more turgid branches and a generally more robust look. The stem leaf of S. tenerum is triangular-lingulate as compared to the lingulate- triangular stem leaf of S. capillifolium. See also discussion under 84. S. subnitens and 87. S. tenerum.
The names Sphagnum acutifolium Schrader and S. nemoreum Scopoli (doubtful name) have also been used for this taxon.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Sporophytes are uncommon in Sphagnum russowii. This species is associated with S. centrale, S. fallax, S. fimbriatum, S. girgensohnii, and S. squarrosum. Because of its not particularly distinct phenotype as well its strong tendency to produce hemiisophyllous stem leaves, S. russowii is probably the most frequently misidentified Sphagnum species. The combination of the flat, stellate capitulum, unranked branch leaves, and lingulate stem leaf will usually suffice to identify it. Sphagnum capillifolium has a rounded capitulum and a pointed stem leaf while S. subtile also has a rounded capitulum but a shorter and more triangular stem leaf. In montane and arctic mires it can be confused with S. warnstorfii but the latter usually has conspicuously 5-ranked branch leaves. As one might expect in such a widespread and common species, the characters can vary considerably. For example, one regularly finds plants that are consistent in every respect with the description except that they lack stem cortical pores. Some stem leaves have almost no septations in the hyaline cells while other forms have most of the cells septate. As with similar variation in the likewise common S. fuscum, there is no consistent pattern and so taxonomic recognition of the variants is unwarranted.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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