Sphagnum teres |
Sphagnum riparium |
|
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rigid peat-moss, sphagnum |
cleft peat-moss, streamside sphagnum |
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Habit | Plants fairly slender to moderate-sized, pale green to yellowish, or reddish brown in sun-grown forms; forms loose to dense carpets. | Plants stiff and upright, large; green to pale green to brownish, capitulum large and flat, with a conspicuous terminal bud. |
Stem(s) | leaves generally larger than branch leaves, 1.3– 1.8 × 0.8–1 mm; elliptic to lingulate-spatulate, widest above middle, hyaline cells nonseptate. |
leaves triangular-lingulate, 1.2–1.4 mm; apex with a deep lacerate split; hyaline cells aporose, efibrillose and often septate. |
Branches | long-cylindrical, branch leaves terete to sometimes distinctly squarrose in shade forms. |
unranked to rarely 5-ranked, branch leaves only weakly undulate, but sharply recurved at the apex, leaves not much elongated at distal end. |
Branch leaves | 1–1.4 mm, ovate to ovate-lanceolate, gradually narrowed to an involute tip, hyaline cells somewhat bulging on concave surface and nearly plane on convex surface, with 4–8 large, elliptic, unringed pores per cell on convex surface and 1–4 irregularly rounded pores per cell on concave surface, internal commissural walls smooth to rather strongly papillose, chlorophyllous cells ovate-triangular with the widest part at or close to the convex surface. |
ovate-lanceolate; 2–2.6 mm; straight; weakly undulate but strongly recurved, hyaline cells on convex surface with very large irregular pores (formed from the confluence of several smaller pores) at the cell apex, concave surface with large round wall thinnings in the cell angles; chlorophyllous cells triangular to trapezoidal in transverse section, apex normally slightly exposed on concave surface. |
Sexual condition | dioicous. |
dioicous. |
Spores | 21–26 µm; proximal and distal surfaces smooth, papillae indistinct; proximal laesura 0.5–0.6 spore radius. |
22–28 µm; proximal surface noticeably papillose, distal surface smooth or with fewer papillae; proximal laesura more than 0.5 the length of the radius. |
Branch | fascicles typically with 3 spreading (sometimes 2) and 2 pendent branches.; branch stems with single layer of cortical cells. |
fascicles with 2 spreading and 2 pendent branches.; branch stem green, cortex enlarged with retort cells. |
Sphagnum teres |
Sphagnum riparium |
|
Phenology | Sporophytes uncommon, capsules mature late spring to early summer. | |
Habitat | Strongly minerotrophic, in open to medium rich fens, less frequent in coniferous mires, characteristic species of rich, weakly acidic to slightly basic mires | Forming often extensive carpets in weakly minerotrophic mires |
Elevation | low to high elevations | low to moderate elevations |
Distribution |
AK; CA; CO; CT; IA; ID; IL; IN; MA; ME; MI; MN; MT; ND; NH; NJ; NY; OH; OR; PA; VT; WA; WI; WY; AB; BC; MB; NF; NS; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
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AK; CT; IN; MA; ME; MI; MN; MT; NH; NJ; NY; OH; PA; VT; WA; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Greenland; Eurasia |
Discussion | Shade forms of Sphagnum teres are often squarrose but these are usually considerably smaller than S. squarrosum. For other distinctions between these species, see discussion under the latter. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporophytes are uncommon in Sphagnum riparium. This species is typically very easily recognized in the field with its pale green color, strong terminal bud, and unranked branch leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 59. | FNA vol. 27, p. 75. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Squarrosa | Sphagnaceae > Sphagnum > sect. Cuspidata |
Sibling taxa | ||
Synonyms | S. squarrosum var. teres, S. teres var. squarrosulum | |
Name authority | Ångström: in C. J. Hartman, Handb. Skand Fl. ed. 8, 417. (1861) | Ångström: Öfvers. Kongl. Vetensk.-Akad. Förh. 21: 198. (1864) |
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