Sphagnum warnstorfii
Sphagnum perichaetiale
Warnstorf's peat-moss, Warnstorf's sphagnum
sphagnum
leaves triangular-lingulate to lingulate, 1.1–1.4 mm, apex broad-rounded to narrowly truncate, border very broad at base (more than 0.3 width);
hyaline cells efibrillose, rhombic, mostly 1-septate but can be non-septate.
leaves to 1.1 × 0.7 mm, commonly hemiisophyllous;
hyaline cells non-ornamented, mostly 1–2-septate.
long and tapering, usually strongly 5-ranked.
short and blunt at distal end, leaves loosely spreading.
ovate-lanceolate, 0.9–1.4 mm, concave, straight, apex involute;
hyaline cells on convex surface with very small ringed pores (less than 0.25 cell width) along commissures near apex, changing abruptly to large elliptical pores (0.4 cell width or more) basally, concave surface with large round pores in proximal margins and leaf base.
ovate, to 2.2 × 1.1 mm; ovate, hyaline cells non-ornamented, on proximal half of convex surface with small ringed pores or pseudopores in groups of three where the corners join and pseudopores along the commissures; chlorophyllous cells narrowly rectangular, lenticular to narrowly trapezoidal in transverse section; exposed equally on both surfaces or more broadly on concave surface;
end walls not thickened.
dioicous.
dioicous.
with numerous pseudostomata.
17–26 µm, finely papillose on both surfaces;
proximal laesura less than 0.5 spore radius.
25–39 µm;
surface smooth to irregularly and finely papillose;
indistinct Y-mark on distal surface;
proximal laesura more than 0.6 spore radius.
fascicles with 2 spreading and 1–2 pendent branches.
fascicles with 2 spreading and 1–2 pendent branches.;
branch stems with hyaline cells non-ornamented, no or weak funnel-like projection of end walls of cortical cells, cortical cells with one large pore per cell on superficial wall.
Sphagnum warnstorfii
Sphagnum perichaetiale
Sporophytes are uncommon in Sphagnum warnstorfii. This is one of the most minerotrophic species of the flora, is hygrophytic, and has a very broad niche. The most commonly associated vascular plants are Thuja occidentalis, Abies balsamea, and Picea rubens. Bryophytes typically associated with it are S. centrale, S. squarrosum, S. teres, Calliergonella cuspidata, and Campylium stellatum. This species is perhaps most similar to S. bartlettianum, with which it has small range overlap. Sphagnum warnstorfii has a shorter and less sharply pointed stem leaf and the red color with a characteristic bluish caste compared to the crimson red of S. bartlettianum. See also discussion under 81. S. russowii and 86. S. talbotianum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The compact growth form in thin but dense mats and occurrence in often dessication-prone sites distinguishes Sphagnum perichaetiale from any other species of sect. Sphagnum. The often quite stiffly spreading branch leaves give it a strong resemblance to S. compactum, but the latter’s small triangular stem leaves will readily distinguish that species. The branch leaf hyaline cells of S. perichaetiale have only a few pores on their convex surface, and they are typically small, thickened, and grouped in 3s where the cell corners meet. Similar species in sect. Sphagnum have more pores along the commissures, and they are more elliptical and not thickened. The often hemiisophyllous stem leaves are also diagnostic of S. perichaetiale within the section.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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