Sphagnum microcarpum |
Sphagnum isoviitae |
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Habit | Plants small; green to light green, capitulum indistinct. | Plants moderate-sized and moderately weak-stemmed to moderately stiff; green, brownish green to brown; capitulum flat-topped and 5-radiate, terminal bud often visible. |
Stem(s) | leaves isophyllous, ovate to ovate-lanceolate, 2.2–2.8 mm; apex rounded; hyaline cells nonseptate, convex surface with 6–12 pores per cell along commissures, concave surface aporose. |
leaves triangular to lingulate-triangular, equal to or more than 0.8 mm, spreading to appressed; apex acute to apiculate, hyaline cells mostly efibrillose and nonseptate. |
Branches | straight and short. |
± straight and somewhat tapered, usually 5-ranked, leaves not greatly elongated at branch distal end. |
Branch leaves | ovate, 1.3–1.7 mm; hyaline cells on convex surface with 8–18 elliptic pores more than 8 µm, concave surface aporose. |
narrowly ovate-lanceolate, greater than 1.2 mm, straight, slightly undulate and weakly recurved when dry, margins entire; hyaline cells on convex surface with 1 pore per cell in apical end, on concave surface with round wall thinnings in the cell ends and angles; chlorophyllous cells in transverse section triangular to ovate-triangular and well-enclosed on the concave surface. |
Sexual condition | unknown. |
dioicous. |
Capsule | not seen. |
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Spores | not seen. |
24–33 µm; finely papillose on the superficial surface. |
Branch | fascicles nearly all with 2 spreading branch only. |
fascicles with 2 spreading and 2–3 pendent branches.; branch stems green and often reddish at proximal end, with cortex enlarged with conspicuous retort cells. |
Sphagnum microcarpum |
Sphagnum isoviitae |
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Habitat | Ruderal sites such as dessication-prone depressions, ditches, tire tracks, and natural depressions among tussocks | Forming carpets in a wide variety of poor to medium fen habitats of both mire edge and mire wide character, not found in ombrotrophic mires |
Elevation | low elevations | low to moderate elevations |
Distribution |
FL; LA; NC |
CT; IN; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; VA; VT; WV; AB; NF; NS; QC; Europe |
Discussion | Sporophytes are rare in Sphagnum microcarpum, which grows over bare soil in a manner similar to that of S. cyclophyllum and S. fitzgeraldii. It is now recognized as separate from S. cyclophyllum, with which it has been treated as synonymous in the past. Besides the microscopic differences, S. microcarpum has a compact upright growth form quite unlike that of typical S. cyclophyllum. Sphagnum microcarpum is nearly always branched whereas S. cyclophyllum is nearly always simplex. The name Sphagnum mobilense Warnstorf also has been applied to this taxon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporophytes are uncommon in Sphagnum isoviitae. See discussion under 26. S. brevifolium and 28. S. fallax for distinction from these similar species. Sphagnum isoviitae has no range overlap with S. pacificum, the other North American species of the S. recurvum complex with apiculate stem leaves; the sharply recurved branch leaves of the latter, however, would separate it easily in any case. Spore features are those given by Flatberg. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 82. | FNA vol. 27, p. 68. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. microcarpum var. humile | |
Name authority | Warnstorf: Hedwigia 47: 94. (1907) | Flatberg: J. Bryol. 17: 2, figs. 1, 2. (1992) |
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