Sphagnum mississippiense
Sphagnum orientale
Mississippi sphagnum
oriental sphagnum
leaves elongate-triangular, 1.3–1.5 mm; often spreading;
apex obtuse;
hyaline cells mostly efibrillose and 1–septate in proximal half and lateral portions of leaves.
leaves triangular-lingulate to lingulate; 0.7–0.8 mm;
apex rounded and often erose, hyaline cells nonseptate or sometimes 1-septate, numerous small round pores more than 2 µm along the commissures and scattered across the cell on the convex surface, on the concave surface fewer similar-sized pores along the commissures.
unranked, often blunt and with leaves moderately elongated at distal end.
short and slightly curved Branch fascicles with 2 spreading and 2 pendent branches.
ovate to broadly ovate at branch base and becoming ovate-lanceolate at branch tip; 1.2–1.5 mm; undulate when dry, margins serrulate;
hyaline cells of convex surface with 0–5 pores or pseudopores at cell apex, concave surface with faint round wall thinnings in cell angles, but may be absent, chlorophyllous cells trapezoidal in transverse section, exposed more broadly on convex surface.
ovate, 1.1–1.3 mm, distinctly curved to secund;
hyaline cells covered with numerous (more than 30 per cell) tiny pores (ca. 1 µm) on convex surface along the commissures and across the cell surface, sometimes forming several linear rows of free pores, on concave surface with fewer pores round to oval and slightly larger (more than 2 µm) restricted to commissures.
probably dioicous.
probably dioicous.
not seen.
not seen.
not seen.
fascicles with 2–3 spreading and 0–2 pendent branches.;
branch stems green, with cortex enlarged with conspicuous retort cells.
Sphagnum mississippiense
Sphagnum orientale
Sporophytes of Sphagnum mississippiense are unknown. The combination of broad branch leaves and obtuse stem leaves will distinguish it from S. cuspidatum and S. viride. The much commoner and more wide-ranging S. trinitense, although also having serrulate branch leaves, has much narrower branch leaves that are more elongate at the branch tips, becoming quite lanceolate as compared with the ovate-lanceolate branch leaves that S. mississippiense exhibits at its branch tips.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The ecology of Sphagnum orientale is poorly known, due in part to taxonomic confusion with S. perfoliatum and in part to its very northern distribution. Like other species of sect. Subsecunda, however, it is clearly minerotrophic, probably weakly so. Associated vascular plants include Carex aquatilis Wahlenberg, C. bigelowii Torrey, C. fuliginosa Schkuhr, C. rotundata Wahlenberg, Eriophorum vaginatum Linnaeus, Vaccinium oxycoccus Linnaeus, and Betula glandulosa Michaux. Associated bryophytes include Sphagnum aongstroemii, S. fimbriatum subsp. concinnum, S. jensenii, S. obtusum, S. rubellum, S. talbotianum, S. squarrosum, and Cinclidium subrotundatum. Sporophytes are rare. Similar species with which it overlaps in range are S. subsecundum, S. perfoliatum and S. inexspectatum. Field separation from S. subsecundum and S. inexspectatum is difficult but the tiny branch leaf pores will separate it microsopically. Sphagnum perfoliatum is much larger and indeed looks much like some forms of S. lescurii or S.auriculatum, even to having curved, horn-like branches. Sphagnum perfoliatum is also typically quite richly colored and glossy in appearance.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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