Sphagnum sitchense |
Sphagnum inexspectatum |
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Habit | Plants moderate-sized; capitulum flat-topped and dense; pale yellow and pink, lacking sheen. | Plants moderate-sized, normally erect; yellowish to reddish brown, greenish in shaded forms; capitulum moderately distinct and rounded. |
Stem(s) | pink, superficial cortical cells aporose.; stem leaves narrowly triangular to lingulate- triangular, 1.2–1.6 × 0.6–0.8 mm, length: width ratio ca. 2:1, apex apiculate, border strong and moderately broadened basally; hyaline cells narrowly rhomboid and 1 to occasionally 2 septate, often fibrillose apically. |
leaves triangular-lingulate to ovate-lingulate, 0.8–0.9 mm, apex rounded, straight; hyaline cells mostly non-septate, fibrillose in distal 1/3–2/3 of leaf, a few ringed pores at corners of cells and along commissures on convex surface, ringed pores along the commissures on the concave surface in greater numbers than on convex surface. |
Branches | not 5-ranked. |
short, not turgid. |
Branch leaves | 1.3–1.5 × 0.5–0.55 mm, ovate-lanceolate, concave, straight, apex involute; hyaline cells on convex surface with numerous round to elliptic pores along the commissures, grading from large elliptical pores at the base to moderate-sized round pores at the apex, concave surface with a few large round pores scattered throughout. |
broad-ovate to ovate-lanceolate, 0.9–2.1 mm, straight; hyaline cells with numerous ringed pores (10–20) along the commissures on the convex surface, a few pseudopores and ringed pores (less than 8 per cell) occur on the cell angles on the concave surface. |
Sexual condition | unknown. |
dioicous. |
Capsule | exserted, with few pseudostomata. |
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Spores | 36–39 µm; coarsely papillose on both surfaces; proximal laesura less than or equal to 0.5 spore radius. |
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Branch | fascicles with 2 spreading and 1 pendent branch. |
fascicles with 2–3 spreading and 1–2 pendent branches. |
Sphagnum sitchense |
Sphagnum inexspectatum |
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Habitat | Known only from type locality where it was forming low dense hummocks in alpine tundra | Ecology unclear, but growing in carpets in depressions, blanket mires |
Elevation | moderate elevations | low to moderate elevations |
Distribution |
AK |
AK; BC; Asia |
Discussion | Sphagnum inexpectatum is frequently collected with S. tenellum, S. pacificum, S. andersonianum, and S. rubellum in weakly minerotrophic blanket mires. It is similar in size to S. subsecundum, with which its range completely overlaps. The latter species has many of the branch leaves subsecund while those of S. inexspectatum are straight. The stem leaves of S. inexspectatum are also conspicuously larger than those of S. subsecundum. Microscopically Sphagnum inexspectatum has a stem cortex that has enlarged thin-walled cells that form 1–2 layers, whereas S. subsecundum has only one. The stem leaves of S. inexspectatum also have numerous commissural pores in the hyaline cells in the distal half of the concave surface, whereas S. subsecundum has only a few if any in this region and these are more free than commissural. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 27, p. 98. | FNA vol. 27, p. 80. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. subsecundum var. andrusii, S. subsecundum var. junsaiense | |
Name authority | R. E. Andrus: Sida 22: 969, figs. 27–34. (2006) | Flatberg: Lindbergia 30: 59. (2005) |
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