Sphagnum compactum |
Sphagnum annulatum |
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compact peat-moss, low sphagnum |
sphagnum |
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Habit | Plants moderate to large-sized, dense and compact, pale green, brownish white, golden brown to variegated golden brown, can be reddish in rocky seep habitats; forms small, tufted compact cushions. | Plants moderate-sized and weak-stemmed; in lawns and floating mats; brownish green, brown, reddish brown to chestnut-brown, often with bluish tint when dry, capitulum 5-radiate and flat-topped. |
Stem(s) | leaves small, 0.3–0.7 mm, triangular-lingulate with broad rounded apex, Branches short, crowded, and unranked. |
leaves lingulate-triangular to triangular-lingulate, equal to or less than 1.2 mm, more or less spreading; apex obtuse; hyaline cells mostly fibrillose and nonseptate. |
Branches | straight to distinctly curved, leaves becoming substantially longer at distal end of the branch. |
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Branch leaves | large, 1.4–3 mm, semi-squarrose to squarrose, ovate and abruptly involute in distal portion, appearing cucullate with toothed apex, usually no more than 6 teeth; hyaline cells with 5 or more ringed, round to elliptical pores on convex surface, numerous pseudopores on concave surface with 3-ringed corner pores occurring in 3s at adjacent cell angles; chlorophyllous cells elliptic in transverse section, entirely included by hyaline cells, slightly nearer to convex surface. |
ovate-lanceolate, 1.5–2 mm, straight to slightly subsecund, only slightly undulate and recurved if at all; margin entire; hyaline cells on convex surface with numerous small free pores, on concave surface with numerous round free pores, cells relatively short in basal region (similar to mid region); chlorophyllous cells ± triangular in transverse section, just reaching concave surface or slightly enclosed. |
Sexual condition | monoicous. |
dioicous. |
Capsule | with abundant pseudostomata. |
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Spores | 25–35 µm; finely papillose on proximal surface, coarsely papillose on distal surface with raised Y-mark sculpture; proximal laesura short, 0.3–0.5 spore radius. |
25–32 µm, finely papillose on both surfaces. |
Branch | fascicles 4–6 branches per fascicle, 2–3 spreading and 2–3 pendent, but plants frequently unbranched in young clones. |
fascicles with 2 spreading and 1–2 pendent branches.; branch stems green, with cortex enlarged with conspicuous retort cells. |
Sphagnum compactum |
Sphagnum annulatum |
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Phenology | Capsules fairly common, mature summer. | |
Habitat | Ombrotrophic to weakly minerotrophic, commonly growing on poorly drained sand, siliceous rocks, bare peat | Wet carpets, lawns, and mud bottoms in poor to medium fens, in mire-wide and mire-edge habitats |
Elevation | low to high elevations | low to high elevations |
Distribution |
AK; AR; CA; CT; FL; GA; IA; IL; IN; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NH; NJ; NY; OH; OR; PA; SC; TN; VA; VT; WA; WI; WV; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; South America; Greenland; Eurasia; Pacific Islands (New Zealand)
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AK; ID; MI; MN; MT; NY; WA; WY; AB; BC; MB; NF; NT; ON; QC; YT; Eurasia |
Discussion | Sphagnum compactum is usually easily recognized by its combination of golden brown color and involute, cucullate branch leaves. Sphagnum strictum is paler and usually strongly squarrose. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporophytes are rare in Sphagnum annulatum. Of the more wet-growing species, both S. cuspidatum and S. viride are typically much more green or yellow and have stem leaves with acute apices. Sphagnum jensenii is usually larger and has straight capitulum branches as opposed to the more curved branches of S. annulatum. Sphagnum majus normally has a denser and more rounded capitulum. Field experience in both Alaska and Scandanavia, where both species occur, does not support the view of H. A. Crum (1997) that S. annulatum and S. jensenii are simply ends of a continuum. Both species are usually readily separable in the field and look quite different in mixed populations. In North America at least S. annulatum is also considerably more widespread. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 56. | FNA vol. 27, p. 64. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Rigida | Sphagnaceae > Sphagnum > sect. Cuspidata |
Sibling taxa | ||
Synonyms | S. compactum var. imbricatum, S. rigidum | S. jensenii var. annulatum |
Name authority | Lamarck & de Candolle: Fl. Franç. ed. 3, 2: 443. (1805) | Warnstorf: Bot. Centralbl. 76: 422. (1898) |
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