Sphagnum pacificum |
Sphagnum tundrae |
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Pacific sphagnum |
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Habit | Plants moderate-sized and fairly strong-stemmed; green, yellow to yellowish brown; capitulum 5radiate in shade forms to hemispherical in open grown or drier growing forms. | Plants small to moderately robust, green to yellow green, with a brownish tinge in hummocks; forms mats and cushions. |
Stem(s) | leaves triangular to lingulate-triangular, 0.8–1.3 mm; typically appressed; apex acute to apiculate; hyaline cells efibrillose and nonseptate to rarely septate. |
leaves shorter than branch leaves, 0.8–1.6 mm, lingulate, hyaline cells non-septate above and commonly 1-septate below. |
Branches | straight and somewhat tapered, usually 5-ranked; leaves little elongate at the distal branch end. |
short and blunt, branch leaves imbricate. |
Branch leaves | ovate to narrowly ovate-lanceolate; (1.1–)1.4–1.8(–3.1) mm; slightly undulate and sharply recurved when dry, somewhat subsecund; margins entire; hyaline cells on convex surface with usually 1 round pore on apical end, on concave surface with wall thinnings in the cell ends and angles; chlorophyllous cells broadly triangular in transverse section and very deeply enclosed on the concave surface. |
0.9–2 mm, ovate, with conspicuously truncate apex, hyaline cells bulging on both surfaces, with 1–4 large circular to elliptic pores per cell on convex surface and 4–7 elliptic pores per cell on concave surface, internal commissural walls faintly papillose, cholrophyll cells elliptical to elliptical-ovate withn the broadest part typically some distance from convex surface. |
Sexual condition | dioicous. |
unknown. |
Spores | 19–25 µm; finely papillose on both surfaces. |
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Branch | fascicles with 2 spreading and 2–3 pendent branches.; branch stems green but often reddish at proximal end, with cortex enlarged with conspicuous retort cells. |
fascicles typically with 2 spreading and 2 hanging branches.; branch stems with single layer of cortical cells. |
Sphagnum pacificum |
Sphagnum tundrae |
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Habitat | Forested and open poor fen habitats, often as a ruderal species in extensive mats | Forms mats and cushions in weakly minerotrophic arctic mires |
Elevation | low to moderate elevations | low elevations |
Distribution |
AK; OR; WA; BC |
AK; YT; Europe |
Discussion | Sporophytes in Sphagnum pacificum are uncommon. See discussion under 26. S. brevifolium. Characters of the spores are taken from Flatberg’s description. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sphagnum tundrae can be separated from other species in sect. Squarrosa most readily by its truncate branch leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 74. | FNA vol. 27, p. 60. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Flatberg: Bryologist 92: 116, figs. 1–20. (1989) | Flatberg: Lindbergia 19: 3, figs. 1–3. (1994) |
Web links |