Sphagnum angustifolium |
Sphagnum isoviitae |
|
---|---|---|
fine bogmoss, poor-fen peat-moss, sphagnum |
|
|
Habit | Plants small and often slender and soft, lax to compact, moderately stiff-stemmed; green to pale yellow to golden brown to brown; capitulum strongly convex in drier grown forms to strongly 5-radiate and flat in wetter growing forms. | 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 equilateral to isosceles-triangular, small, less than 0.8 mm, mostly appressed to stem, apex acute to obtuse, hyaline cells efibrillose and nonseptate. |
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 to slightly curved, usually 5-ranked; leaves not much longer at distal end than proximal end. |
± straight and somewhat tapered, usually 5-ranked, leaves not greatly elongated at branch distal end. |
Branch leaves | narrowly ovate-lanceolate, 0.8–1 mm, straight, moderately undulate and recurved in larger and/or wetter grown forms, not undulate and slightly recurved in compact forms from drier sites; margins entire; hyaline cells on convex surface with 1(2–3) pore per cell at apical end of cell, on concave surface with round wall thinnings in cell ends and angles; chlorophyllous cells triangular in transverse section and just enclosed on concave surface. |
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 | dioicous. |
dioicous. |
Spores | 21–25 µm; coarsely papillose on proximal and distal surfaces; proximal laesura more than 0.5 spore radius. |
24–33 µm; finely papillose on the superficial surface. |
Branch | fascicles with 2 spreading and 2–3 pendent branches.; branch stems with cortex enlarged with conspicuous retort cells, often pinkish red at proximal end. |
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 angustifolium |
Sphagnum isoviitae |
|
Habitat | Wide range of habitats, from ombrotrophic to rich fens, open mires, sedge fens and muskeg, as carpets, floating mats, low hummocks and hummock sides | 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 to high elevations | low to moderate elevations |
Distribution |
AK; CA; CO; ID; IL; IN; MA; MD; ME; MI; MN; MO; MT; NC; ND; NH; NJ; NY; OH; OR; PA; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; QC; SK; YT; Greenland; Eurasia
|
CT; IN; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; VA; VT; WV; AB; NF; NS; QC; Europe |
Discussion | The sporophytes of Sphagnum angustifolium are somewhat common. This species is distinguished from similar ones in sect. Cuspidata by the small, triangular, obtuse and appressed stem leaves. It also often has a pink stem, as opposed to the reddish branch bases seen in some other species of the section. Sphagnum balticum has stem leaves that are more lingulate-triangular as well as spreading from the stem. Sphagnum angustifolium belongs to a subgroup within sect. Cuspidata usually referred to as S. recurvum, in the broad sense, a group of mostly carpet-forming species that differ from other members of the section in having pairs of pendent branch buds visible between the capitulum rays. The group also includes S. brevifolium, S. fallax, S. flexuosum, S. pacificum, S. recurvum, S. rubroflexuosum, and S. splendens. (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. 64. | FNA vol. 27, p. 68. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Cuspidata | Sphagnaceae > Sphagnum > sect. Cuspidata |
Sibling taxa | ||
Synonyms | S. recurvum var. angustifolium, S. amblyphyllum var. parvifolium, S. flexuosum var. tenue, S. parvifolium, S. recurvum var. parvifolium, S. recurvum var. tenue | |
Name authority | (Warnstorf) C. E. O. Jensen: Bih. Svenska Vetensk.-Akad. Handl. 16(9): 46. (1891) | Flatberg: J. Bryol. 17: 2, figs. 1, 2. (1992) |
Web links |
|