Sphagnum fimbriatum |
Sphagnum steerei |
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fringe bogmoss, fringe peat-moss, sphagnum |
steere's sphagnum |
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Habit | Plants typically small and slender, larger and compact in the Arctic, capitulum small to moderate-sized, often with a conspicuous terminal bud; green, yellowish brown to brown; without metallic lustre when dry. | Plants moderate-sized to large, compact and stiff-stemmed with upswept branches; dark green and brown, dark chesnut brown, brown to blackish brown, often with bluish tinge when dry; forming dense low to moderately tall hummocks. | ||||
Stem(s) | leaves spatulate to broad-spatulate, 0.8–1.5(–2) mm, strongly lacerate across the broad apex and often part way down the margins, border scarcely to strongly broadened at base (0.25 width of base or less); hyaline cells rhomboid, efibrillose and often 1–2-septate. |
leaves to 1.2 × 0.8 mm; rarely hemiisophyllous; hyaline cells mostly nonseptate, comb-lamellae usually absent, but sometimes weak. |
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Branches | not 5-ranked, quite terete, long, and slender Branch fascicles with 1– 2 spreading and 1–2 pendent branches. |
short and blunt-tipped, leaves spreading. |
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Branch leaves | ovate to ovate-lanceolate; 1.1–1.5(–2) mm, slightly concave, straight; apex involute; margins entire; hyaline cells on convex surface with numerous pores along the commissures grading from small pores near leaf apex to large pores at base, concave surface with large round pores at leaf apex and along margins. |
ovate to ovate-elliptical, 1.6–2.2 × 1 mm; hyaline cells on proximal half of convex surface with round to elliptic pores along the commissures; comb-lamellae on hyaline cell wall where overlying chlorophyllous cells; chlorophyllous cells broadly triangular in transverse section and well-enclosed on convex surface, end wall not thickened. |
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Sexual condition | often monoicous. |
dioicous. |
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Capsule | unknown. |
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Spores | 20–27 µm, finely papillose on both surfaces; proximal laesura less than 0.5 spore radius. |
unknown. |
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Branch | fascicles with 2 spreading and 1 pendent branch.; branch stems with hyaline cells non-ornamented, no or weak funnel-like projections on the end walls of cortical cells, cortical cell walls usually with large round pores. |
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Sphagnum fimbriatum |
Sphagnum steerei |
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Habitat | Commonly in firm-bottomed poor to medium fen vegetation, subarctic to arctic regions | |||||
Elevation | low to moderate elevations | |||||
Distribution |
North America; South America; Eurasia; Pacific Islands (New Zealand)
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AK; MB; NT; NU; QC; YT; e Asia |
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sphagnum steerei is usually easily recognized in the field by its dense growth habit and dark brown color. Its ecology is somewhat unclear due to taxonomic confusion with S. imbricatum in the strict sense and S. austinii (R. E. Andrus 1987). The latter is the only species in the imbricatum complex that occurs where S. steerei does. Contrary to the view of H. A. Crum (1997), S. steerei is quite distinct from S. affine and S. austinii. There is no range overlap with either of those species and the macroscopic appearance is also quite different. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 27, p. 92. | FNA vol. 27, p. 54. | ||||
Parent taxa | Sphagnaceae > Sphagnum > sect. Acutifolia | Sphagnaceae > Sphagnum > sect. Sphagnum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | S. imbricatum var. arcticum | |||||
Name authority | Wilson & Hooker: in J. D. Hooker, Fl. Antarct., 398. (1847) | R. E. Andrus: Bryologist 90: 218. (1987) | ||||
Web links |