Sphagnum cuspidatum
Sphagnum lescurii
feathery bog-moss, feathery peat-moss, tooth sphagnum
Lescur's 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 lingulate to ovate-lingulate, 1.3–2 mm;
apex truncate to rounded, usually denticulate;
hyaline cells typically fibrillose for 1/2 of leaf or more, often 1–2-septate, convex surface with 4–12 or more pores per cell along the commissures, concave surface with fewer pores.
mostly unranked to weakly 5-ranked, often conspicuously falcate, leaves greatly elongated at distal end.
usually curving, often large and tumid.
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.
broadly ovate to ovate-lanceolate, 1.3–2.5 mm, greatly elongated in aquatic forms, straight or infrequently subsecund or subsquarrose;
hyaline cells with 10–22 pores along the commissures on the convex surface, no or fewer pores per cell (1–8) 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.
27–34 µm; finely papillose on both surfaces, with distinct raised Y-mark sculpture (indistinctly bifurcated Y-mark) on the distal surface;
proximal laesura less than 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(rarely 3) spreading and 1–2(–3) pendent branches.
Sphagnum cuspidatum
Sphagnum lescurii
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.)
Sporophytes are uncommon in Sphagnum lescurii, which may be the most phenotypically variable of all the North American Sphagnum species, and quite probably deserves some taxonomic splitting. The tremendous phenotypic plasticity of this species, however, makes it quite difficult to sort out the genotypic component of variability, and thus most sphagnologists since Warnstorf have avoided the temptation of splitting and have instead treated this as one very variable species. This is the approach maintained in this treatment. We have also chosen not to use the earlier name S. denticulatum because its type is a phenotypic morphotype not clearly assignable to the current concept of either S. auriculatum or S. lescurii (K. I. Flatberg, pers. comm.). Some of the American material assignable to S. lescurii is quite likely the same as the European species S. auriculatum, but much of our material is certainly not the same. Until more definitive data are available, we have chosen to continue to use the name S. lescurii. The large stem leaf will generally distinguish this from similar species of sect. Subsecunda. See also discussion under 55. S. inundatum and 61. S. platyphyllum.
The names Sphagnum alabamae Warnstorf, S. aquatile Warnstorf, S. obesum (Wilson) Warnstorf, S. rufescens (Nees & Hornschuch) Warnstorf, and S. turgidulum Warnstorf also have been applied to this taxon.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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