Sphagnum balticum |
Sphagnum microcarpum |
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Baltic peat-moss, Baltic sphagnum |
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Habit | Plants small to moderate-sized, soft and ± weak-stemmed; brownish green, yellow-green, yellowish to golden brown, capitulum typically flat and 5-radiate. | Plants small; green to light green, capitulum indistinct. |
Stem(s) | leaves 0.8–1.1 mm, triangular-lingulate to lingulate, concave, spreading, apex broadly obtuse, hyaline cells fibrillose in apical region. |
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. |
Branches | slender and tapering, often 5-ranked and decurved, leaves somewhat elongated at distal end. |
straight and short. |
Branch leaves | ovate-lanceolate, 1–1.7 mm, straight, slightly undulate and spreading; margin entire, hyaline cells on convex surface with 1–5 pores in cell ends and free near apex, on concave surface with round wall thinnings in cell ends and angles; chlorophyllous cells triangular in transverse section and well-enclosed on concave surface. |
ovate, 1.3–1.7 mm; hyaline cells on convex surface with 8–18 elliptic pores more than 8 µm, concave surface aporose. |
Sexual condition | dioicous. |
unknown. |
Capsule | not seen. |
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Spores | 25–33 µm; smooth to finely papillose on both surfaces; proximal laesura approximately 0.5 spore radius. |
not seen. |
Branch | fascicles with 2 spreading and mostly 1 pendent branch.; branch stem green, cortex enlarged with conspicuous retort cells. |
fascicles nearly all with 2 spreading branch only. |
Sphagnum balticum |
Sphagnum microcarpum |
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Habitat | Abundant in hollows and floating mats in raised bogs and poor fens | Ruderal sites such as dessication-prone depressions, ditches, tire tracks, and natural depressions among tussocks |
Elevation | low to high elevations | low elevations |
Distribution |
AK; CO; AB; BC; MB; NT; NU; ON; QC; YT; Greenland; Eurasia |
FL; LA; NC |
Discussion | Unlike Sphagnum angustifolium and S. annulatum, S. balticum has stem leaves exerted at right angles to the stem. It also has fewer and weaker hanging branches than does S. angustifolium, which make the stem itself often visible and the stem leaves easier to see. Sphagnum balticum also lacks the paired pendent branch buds between the capitulum rays as seen in S. angustifolium. In Sphagnum kenaiense there are sometimes spreading stem leaves but this species has 2 hanging branches per fascicle. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 27, p. 65. | FNA vol. 27, p. 82. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. recurvum subsp. balticum | S. microcarpum var. humile |
Name authority | (Russow) C. E. O. Jensen: in Botaniske Forening København, Festskrift, 100. (1890) | Warnstorf: Hedwigia 47: 94. (1907) |
Web links |