Sphagnum mirum |
Sphagnum pulchrum |
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sphagnum |
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Habit | Plants fairly slender to moderate-sized, green; forming low dense hummocks. | Plants moderate-sized to robust, often quite dense and compact; green, brownish green, golden brown to dark brown; capitulum flat-topped and not especially 5-radiate. |
Stem(s) | leaves generally longer than branch leaves, 1.1–1.7 mm, lingulate to lingulate-spathulate, hyaline cells mostly non-septate. |
leaves triangular to triangular-lingulate, 0.9–1.1 mm; appressed to spreading; apex apiculate, acute or narrowly obtuse, appressed to spreading; hyaline cells nonseptate and efibrillose. |
Branches | terete. |
straight to more typically curved, typically stout and blunt ended; strongly 5-ranked, leaves not much elongate at distal end. |
Branch leaves | 1–1.4 mm, broadly ovate, with a narrow involute tip; hyaline cells only slightly bulging on either surface, in proximal half of leaf aporose on convex surface and with large faint pores on concave surface; internal commissural walls distinctly papillose; chlorophyllous cells elliptical to elliptical-triangular in transverse section, enclosed on both surfaces with the widest part in the leaf middle. |
ovate to ovate-lanceolate, 1.4–1.8 mm; straight to often subsecund; weakly undulate and slightly recurved; hyaline cells on convex surface with 1 pore per cell at apical end of cell, on concave surface with round wall thinnings in the cells ends and angles; chlorophyllous cells triangular to triangular-ovate in transverse section, very well-enclosed within concave surface. |
Sexual condition | dioicous. |
dioicous. |
Spores | ca. 31 µm, ornamented by small somewhat amalgamated granulae. |
25–28 µm; roughly papillous on both surfaces; proximal laesura more than 0.5 the length of the spore. |
Branch | fascicles of 2 spreading and 1–2 hanging branches.; branch stems with 1–2 layers of cortical cells. |
fascicles with 2 spreading and 2 pendent branches.; branch stems green but often reddish at proximal end, with cortex enlarged with conspicuous retort cells. |
Sphagnum mirum |
Sphagnum pulchrum |
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Phenology | Sporophytes abundant, capsules mature August. | |
Habitat | Ecology poorly known but probably quite minerotrophic | Abundant in poor fens and raised bogs, forming dense carpets at water level, especially on floating mats |
Elevation | low elevations | low to moderate elevations |
Distribution |
AK |
AK; CT; IN; MA; ME; MI; MN; NH; NJ; NY; WI; WV; MB; NB; NF; NS; ON; QC; Europe |
Discussion | Sphagnum mirum has only been recently discovered and so far is known only from its type locality, where it was growing in a fen mixed with S. teres. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporophytes are uncommon in Sphagnum pulchrum. With its distinctive broad and strongly 5-ranked branch leaves, It is one of our most easily recognized species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 58. | FNA vol. 27, p. 74. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. intermedium var. pulchrum | |
Name authority | Flatberg & Thingsgaard: Bryologist 106: 501. (2003) | (Lindberg) Warnstorf: Bot. Centralbl. 82: 42. (1900) |
Web links |