Flora of North America species comparison

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Sphagnum warnstorfii

Sphagnum platyphyllum

Warnstorf's peat-moss, Warnstorf's sphagnum

flat-leaf peat-moss, sphagnum
Habit Plants small or less frequently moderate-sized, slender, capitulum flat-topped and stellate; green or dark purplish red and green, rarely green throughout, often with a distinctive bluish cast when dry. Plants small to moderate-sized, unbranched or sparsely branched; green, golden brown to brown, capitulum small with a large and conspicuous terminal bud.
Stem(s)

leaves triangular-lingulate to lingulate, 1.1–1.4 mm, apex broad-rounded to narrowly truncate, border very broad at base (more than 0.3 width);

hyaline cells efibrillose, rhombic, mostly 1-septate but can be non-septate.

leaves broadly ovate, 1.2–2.2 mm; straight;

apex rounded;

hyaline cells non-septate, convex surface with numerous small pores (less than or equal to 1/6 cell diameter) forming a continuous row along the commissures, concave surface aporose or with a few scattered pores along the commissures and cell ends.
Branches

long and tapering, usually strongly 5-ranked.

short and blunt, sometimes lacking completely and plants simplex.
Branch leaves

ovate-lanceolate, 0.9–1.4 mm, concave, straight, apex involute;

hyaline cells on convex surface with very small ringed pores (less than 0.25 cell width) along commissures near apex, changing abruptly to large elliptical pores (0.4 cell width or more) basally, concave surface with large round pores in proximal margins and leaf base.

broadly ovate, 1.4–2.5(–3) mm; straight;

apex rounded;

hyaline cells as in stem leaf.
Sexual condition

dioicous.

dioicous.
Capsule

exserted, with few pseudostomata.
Spores

17–26 µm, finely papillose on both surfaces;

proximal laesura less than 0.5 spore radius.

23–35 µm;

papillose on both surfaces, with indistinct Y-mark sculpture on distal surface;

proximal laesura 0.5 spore radius or less.
Branch

fascicles with 2 spreading and 1–2 pendent branches.

fascicles of 1–3 branches, 1–2 of these spreading, branches usually not numerous.

Sphagnum warnstorfii

Sphagnum platyphyllum
Phenology Capsules mature late summer to early autumn. Capsules mature late spring to early summer.
Habitat Minerotropic, hygrophytic, frequent in medium to rich fens Typically growing in minerotrophic habitats such as shores of lakes, ponds, streams, flarks of string mires, margins of open fens, especially seasonally flooded sites
Elevation low to moderate elevations low to high elevations
Distribution
from FNA
AK; CO; CT; IA; ID; IN; MA; MD; ME; MI; MN; MT; NC; NH; NJ; NY; OH; PA; RI; SD; UT; VT; WA; WI; WY; AB; BC; MB; NB; NF; NS; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
[WildflowerSearch map]
from FNA
AK; AZ; CA; CO; CT; IN; MA; ME; MI; MN; MT; NH; NJ; NY; OH; OR; RI; VT; WI; WY; AB; BC; MB; NB; NF; ON; QC; YT; South America; Greenland; Eurasia
Discussion

Sporophytes are uncommon in Sphagnum warnstorfii. This is one of the most minerotrophic species of the flora, is hygrophytic, and has a very broad niche. The most commonly associated vascular plants are Thuja occidentalis, Abies balsamea, and Picea rubens. Bryophytes typically associated with it are S. centrale, S. squarrosum, S. teres, Calliergonella cuspidata, and Campylium stellatum. This species is perhaps most similar to S. bartlettianum, with which it has small range overlap. Sphagnum warnstorfii has a shorter and less sharply pointed stem leaf and the red color with a characteristic bluish caste compared to the crimson red of S. bartlettianum. See also discussion under 81. S. russowii and 86. S. talbotianum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Sporophytes are uncommon in Sphagnum platyphyllum, which can be quite variable in size and the development of branch fascicles, with some forms even being simplex while other forms may have up to three branches per fascicle. The species can usually be recognized by the large stem leaves that are spreading and easily visible because of the scarcity of hanging branches. It should also be noted that in this species and S. contortum the 2–3-layered stem cortex is not an entirely consistent trait, as plants quite typical in all other respects are occasionally found with the cortex only 1-layered, at least in part.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 27, p. 101. FNA vol. 27, p. 83.
Parent taxa Sphagnaceae > Sphagnum > sect. Acutifolia Sphagnaceae > Sphagnum > sect. Subsecunda
Sibling taxa
S. affine, S. alaskense, S. andersonianum, S. angermanicum, S. angustifolium, S. annulatum, S. aongstroemii, S. arcticum, S. atlanticum, S. austinii, S. balticum, S. bartlettianum, S. beothuk, S. bergianum, S. brevifolium, S. capillifolium, S. carolinianum, S. centrale, S. compactum, S. contortum, S. cribrosum, S. cuspidatum, S. cyclophyllum, S. fallax, S. fimbriatum, S. fitzgeraldii, S. flavicomans, S. flexuosum, S. fuscum, S. girgensohnii, S. henryense, S. imbricatum, S. inexspectatum, S. inundatum, S. isoviitae, S. jensenii, S. junghuhnianum, S. kenaiense, S. lenense, S. lescurii, S. lindbergii, S. macrophyllum, S. magellanicum, S. majus, S. mcqueenii, S. mendocinum, S. microcarpum, S. mirum, S. mississippiense, S. molle, S. obtusum, S. oregonense, S. orientale, S. pacificum, S. palustre, S. papillosum, S. perfoliatum, S. perichaetiale, S. platyphyllum, S. portoricense, S. pulchrum, S. pylaesii, S. quinquefarium, S. recurvum, S. riparium, S. rubellum, S. rubiginosum, S. rubroflexuosum, S. russowii, S. sitchense, S. splendens, S. squarrosum, S. steerei, S. strictum, S. subfulvum, S. subnitens, S. subsecundum, S. subtile, S. talbotianum, S. tenellum, S. tenerum, S. teres, S. torreyanum, S. trinitense, S. tundrae, S. viride, S. wilfii, S. wulfianum
S. affine, S. alaskense, S. andersonianum, S. angermanicum, S. angustifolium, S. annulatum, S. aongstroemii, S. arcticum, S. atlanticum, S. austinii, S. balticum, S. bartlettianum, S. beothuk, S. bergianum, S. brevifolium, S. capillifolium, S. carolinianum, S. centrale, S. compactum, S. contortum, S. cribrosum, S. cuspidatum, S. cyclophyllum, S. fallax, S. fimbriatum, S. fitzgeraldii, S. flavicomans, S. flexuosum, S. fuscum, S. girgensohnii, S. henryense, S. imbricatum, S. inexspectatum, S. inundatum, S. isoviitae, S. jensenii, S. junghuhnianum, S. kenaiense, S. lenense, S. lescurii, S. lindbergii, S. macrophyllum, S. magellanicum, S. majus, S. mcqueenii, S. mendocinum, S. microcarpum, S. mirum, S. mississippiense, S. molle, S. obtusum, S. oregonense, S. orientale, S. pacificum, S. palustre, S. papillosum, S. perfoliatum, S. perichaetiale, S. portoricense, S. pulchrum, S. pylaesii, S. quinquefarium, S. recurvum, S. riparium, S. rubellum, S. rubiginosum, S. rubroflexuosum, S. russowii, S. sitchense, S. splendens, S. squarrosum, S. steerei, S. strictum, S. subfulvum, S. subnitens, S. subsecundum, S. subtile, S. talbotianum, S. tenellum, S. tenerum, S. teres, S. torreyanum, S. trinitense, S. tundrae, S. viride, S. warnstorfii, S. wilfii, S. wulfianum
Synonyms S. warnstorfianum S. laricinum var. platyphyllum, S. contortum var. platyphyllum, S. subsecundum var. platyphyllum
Name authority Russow: Sitzungs.-Ber. Naturf.-Ges. Univ. Dorpat 8: 315. (1888) (Lindberg) Warnstorf: Flora 67: 481. (1884)
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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