Sphagnum teres |
Sphagnum pylaesii |
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rigid peat-moss, sphagnum |
Pylaes' 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 slender and delicate, aquatic or prostrate, with a conspicuous terminal bud; dark greenish to purplish brown in submerged plants to deep salmon-red in prostrate plants, capitulum quite indistinct but with distinct 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 broadly ovate, 1.5–2(2.5) mm; straight; hyaline cells fibrillose and nearly aporose, with single small pores occasionally found in the distal cell ends on the concave surface. |
Branches | long-cylindrical, branch leaves terete to sometimes distinctly squarrose in shade forms. |
lacking or short and slender. |
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. |
when present similar to stem leaves but smaller, 0.8–1.2 mm, hyaline cells fibrillose and mostly aporose, 1–6 irregularly round-shaped membrane gaps in some cells near apex on convex surface. |
Sexual condition | dioicous. |
dioicous. |
Capsule | usually immersed in perichaetiale leaves, but may be slightly emergent, pseudostomata absent from capsule surface. |
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Spores | 21–26 µm; proximal and distal surfaces smooth, papillae indistinct; proximal laesura 0.5–0.6 spore radius. |
29–41 µm, coarsely papillose on both surfaces, indistinct raised sculpture on distal surface; proximal laesura less than 0.5 spore radius. |
Branch | fascicles typically with 3 spreading (sometimes 2) and 2 pendent branches.; branch stems with single layer of cortical cells. |
fascicles none or 1 spreading branch. |
Sphagnum teres |
Sphagnum pylaesii |
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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 | Weakly minerotrophic, wet rocks, poor fens |
Elevation | low to high elevations | low to high 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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MA; ME; NC; NH; NJ; NF; NS; QC; Greenland; NY ; Europe
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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 rare in Sphagnum pylaesii. This species is distributed as a pioneer on wet rocks associated with S. tenellum and S. papillosum, or in poor fens with S. pulchrum, S. majus, and S. papillosum. See also discussion under 53. S. cyclophyllum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 59. | FNA vol. 27, p. 84. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Squarrosa | Sphagnaceae > Sphagnum > sect. Subsecunda |
Sibling taxa | ||
Synonyms | S. squarrosum var. teres, S. teres var. squarrosulum | Hemitheca pylaiei, S. pylaesii var. austinii, S. pylaesii var. prostratum, S. pylaesii var. ramosum, S. sedoides, S. sedoides var. austinii, S. sedoides var. prostratum |
Name authority | Ångström: in C. J. Hartman, Handb. Skand Fl. ed. 8, 417. (1861) | Bridel: Bryol. Univ. 1: 749. (1827) |
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