Sphagnum cuspidatum
Sphagnum inexspectatum
feathery bog-moss, feathery peat-moss, tooth sphagnum
leaves triangular-ovate, more than 1.2 mm, usually appressed;
apex acute to apiculate, hyaline cells rarely septate or porose, apical region often fibrillose.
leaves triangular-lingulate to ovate-lingulate, 0.8–0.9 mm, apex rounded, straight;
hyaline cells mostly non-septate, fibrillose in distal 1/3–2/3 of leaf, a few ringed pores at corners of cells and along commissures on convex surface, ringed pores along the commissures on the concave surface in greater numbers than on convex surface.
mostly unranked to weakly 5-ranked, often conspicuously falcate, leaves greatly elongated at distal end.
short, not turgid.
ovate-lanceolate to lanceolate, 1.6–5 mm, falcate toward branch tips, when dry often undulate and recurved, rarely weakly serrulate along the margins in submerged forms, leaves from middle of spreading branches with length to width ratio less than or equal to 1:0.28;
hyaline cells length to width ratio in apical convex surface region 8:1 or more, convex surface with 0–1 small round pores at apex, concave surface with faint round wall thinnings in cell apices and angles; chlorophyllous cells triangular to trapezoidal in transverse section, broadly exposed on the convex surface and exposed slightly on the concave surface.
broad-ovate to ovate-lanceolate, 0.9–2.1 mm, straight;
hyaline cells with numerous ringed pores (10–20) along the commissures on the convex surface, a few pseudopores and ringed pores (less than 8 per cell) occur on the cell angles on the concave surface.
dioicous.
dioicous.
exserted, with few pseudostomata.
29–38 µm; covered with large papillae on both surfaces, appearing pusticulate;
proximal laesura less than 0.5 spore radius.
36–39 µm; coarsely papillose on both surfaces;
proximal laesura less than or equal to 0.5 spore radius.
fascicles with 2 spreading and 2–3 pendent branches.;
branch stems green, but often pinkish at the proximal ends, with cortex enlarged with conspicuous retort cells.
fascicles with 2–3 spreading and 1–2 pendent branches.
Sphagnum cuspidatum
Sphagnum inexspectatum
Distinguishing Sphagnum cuspidatum from S. viride is sometimes difficult, as both occur over a similar geographic range and both grow in wet carpets. Sphagnum cuspidatum has narrower branch leaves and usually a distinct red tinge at the branch bases within the capitulum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Sphagnum inexpectatum is frequently collected with S. tenellum, S. pacificum, S. andersonianum, and S. rubellum in weakly minerotrophic blanket mires. It is similar in size to S. subsecundum, with which its range completely overlaps. The latter species has many of the branch leaves subsecund while those of S. inexspectatum are straight. The stem leaves of S. inexspectatum are also conspicuously larger than those of S. subsecundum.
Microscopically Sphagnum inexspectatum has a stem cortex that has enlarged thin-walled cells that form 1–2 layers, whereas S. subsecundum has only one. The stem leaves of S. inexspectatum also have numerous commissural pores in the hyaline cells in the distal half of the concave surface, whereas S. subsecundum has only a few if any in this region and these are more free than commissural.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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