Sphagnum cuspidatum |
Sphagnum viride |
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feathery bog-moss, feathery peat-moss, tooth sphagnum |
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Habit | Plants slender and weak-stemmed, moderate-sized, flaccid and plumose in aquatic forms to more compact in emergent forms, spreading branches often conspicuously falcate, giving capitulum a twisted appearance; green to yellow, often tinged with red, red-brown or brown in capitula. | Plants slender and weak-stemmed, moderate-sized, flaccid and plumose when submerged and stiffer and more compact when emergent; green to yellow, usually not tinged with brown or red; capitulum well defined, flat in submersed forms and more rounded in emergent forms. |
Stem(s) | 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 long triangular-ovate, 1–2 mm; usually appressed; apex acute to apiculate, hyaline cells only rarely septate or aporose but often fibrillose in apical region. |
Branches | mostly unranked to weakly 5-ranked, often conspicuously falcate, leaves greatly elongated at distal end. |
unranked, straight to slightly curved, leaves somewhat elongated at distal end. |
Branch leaves | 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. |
1.5–2.7 mm, ovate-lanceolate to lanceolate; straight to falcate toward branch tips; when dry often undulate and lightly recurved, margins entire to rarely weakly toothed along the margins in flaccid aquatic forms, hyaline cells on convex surface with 0–1 small round pores at apex, on 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 to broadly on the concave surface. |
Sexual condition | dioicous. |
dioicous. |
Spores | 29–38 µm; covered with large papillae on both surfaces, appearing pusticulate; proximal laesura less than 0.5 spore radius. |
30–43 µm; the superficial surface coarsely papillose to papillose reticulate. |
Branch | 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 spreading and 2–3 pendent branches.; branch stems green, cortex enlarged with conspicuous retort cells. |
Sphagnum cuspidatum |
Sphagnum viride |
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Habitat | Widespread forming wet carpets in ombrotrophic to weakly minerotrophic mires | Widespread, forming wet carpets in weakly minerotrophic mires |
Elevation | low to moderate elevations | low to moderate elevations |
Distribution |
AL; CT; DE; FL; GA; IL; IN; KS; MA; MD; ME; MI; MN; MS; NC; NH; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WI; WV; NB; NF; NS; ON; QC; Europe
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AL; CT; DE; FL; IN; MA; ME; MI; MN; NC; NH; NJ; NY; OH; PA; SC; TN; VA; VT; NF; NS; Europe |
Discussion | 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.) |
The sporophytes of Sphagnum viride are uncommon. See discussion under 27. S. cuspidatum for taxonomic distinctions. Spore characters are taken from Flatberg’s description. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 66. | FNA vol. 27, p. 77. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Cuspidata | Sphagnaceae > Sphagnum > sect. Cuspidata |
Sibling taxa | ||
Synonyms | S. cuspidatum var. plumosum, S. faxonii, S. virginianum | |
Name authority | Hoffman: Deutschl. Fl. 2: 22. (1796) | Flatberg: Kongel. Norske Vidensk. Selsk. Skr. (Trondheim) 1: 9, figs. (1988) |
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