Sphagnum rubellum |
Sphagnum bartlettianum |
|
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sphagnum |
Bartlett's sphagnum |
|
Habit | Plants small to moderate-sized, slender, fairly stiff but soft, capitulum flat-topped and stellate; deep maroon-red to variegated red and yellowish green, lacking metallic sheen when dry. | Plants ± moderate-sized, capitula flat-topped and stellate to some-what hemispherical; variegated pale yellowish and red, sometimes partially green or completely red; without metallic lustre when dry. |
Stem(s) | leaves lingulate-triangular to lingulate, 1–1.4 mm, apex broadly rounded but becoming acute in hemiisophyllous forms, border strongly developed at base (more than 0.25 width); hyaline cells rhombic and 0–3-septate with some cells in leaf midregion 2–septate. |
leaves narrowly lingulate-triangular, 1.2–1.8 mm, apex acute to apiculate, border not developed much along margins and narrow at base (occupying less than 0.25 the width of the base); hyaline cells rhombic, mostly 0–1-septate. |
Branches | weakly to strongly 5-ranked. |
usually strongly 5-ranked. |
Branch leaves | ovate to ovate-lanceolate, 0.9–1.2 mm, concave, subsecund on some branches, apex involute; hyaline cells on convex surface with numerous round to elliptic pores along the commissures, grading from small round pores near apex to round pores near base, on concave surface with large round pores in proximal portions of leaf. |
narrowly ovate-lanceolate, 1.2–1.5 mm, concave, straight, apex strongly involute, border entire, hyaline cells on convex surface with 3–9 faintly ringed rounded-elliptic pores along the commissures often quite small apically, largely aporose on concave surface. |
Sexual condition | dioicous. |
dioicous. |
Spores | 18–33 µm, coarsely papillose on both surfaces; proximal laesura less than 0.4 spore radius. |
19–28 µm; coarsely papillose on both surfaces with a distinct ridged border around perimeter of proximal surface; proximal laesura less than 0.5 spore radius. |
Branch | fascicles with 2 spreading and 1–2 pendent branches. |
fascicles with 2 spreading and 1–2 pendent branches. |
Sphagnum rubellum |
Sphagnum bartlettianum |
|
Phenology | Capsules mature mid summer. | Capsules mature late spring to early summer. |
Habitat | Poor fens and ombrotrophic mires, forming extensive carpets and hummocks | Ecology poorly understood, more southern weakly minerotrophic sites such as the mires in the Pine Barrens of N.J. and the pocosins of the Atlantic coastal plain |
Elevation | low to high elevations | low to moderate elevations |
Distribution |
AK; CT; IL; IN; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; OR; PA; RI; VT; WA; WI; BC; NB; NF; NS; NT; ON; PE; QC; YT; Greenland; Eurasia
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AK; AL; AR; CA; CT; DE; FL; IL; IN; KY; MA; MD; ME; MO; MS; NC; NH; NJ; NY; OH; OR; PA; RI; SC; TN; VA; VT; WI; WV; BC; NB; NF; NS; QC; Europe |
Discussion | Sporophytes are uncommon in Sphagnum rubellum. This common species is associated with S. angustifolium, S. capillifolium, S. fallax, S. fuscum, S. magellanicum, S. papillosum, S. recurvum, and S. tenellum. Inland, it has a greater tendency to form extensive carpets and floating mats than hummocks. See also discussion under 65. S. andersonianum, 68. S. bartlettianum, and 86. S. talbotianum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporophytes are not common in Sphagnum bartlettianum. Confusion is most likely with S. rubellum, with which it frequently co-occurs in the northern part of its range. The ecology is poorly understood due to taxonomic confusion with S. rubellum; the latter species, however, is more typical of boreal poor fens and bogs. Sphagnum bartlettianum has a narrower stem leaf with a distinctly pointed and even apiculate tip, whereas the stem leaf on S. rubellum is quite rounded. The branch leaves of S. bartlettianum are also narrower than those of S. rubellum and are never subsecund as in the latter. Sphagnum quinquefarium has shorter and wider stem leaves as well as often having 3 spreading branches per fascicle. Sphagnum wilfii can appear quite similar and it does overlap the range of S. bartlettianum in coastal British Columbia and southeastern Alaska. Sphagnum wilfii has a stem leaf that is triangular to triangular-lingulate in contrast to the narrowly lingulate-triangular stem leaf of S. bartlettianum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 27, p. 96. | FNA vol. 27, p. 90. |
Parent taxa | Sphagnaceae > Sphagnum > sect. Acutifolia | Sphagnaceae > Sphagnum > sect. Acutifolia |
Sibling taxa | ||
Synonyms | S. acutifolium var. tenellum, S. capillaceum var. tenellum, S. capillifolium var. tenellum | S. bartlettianum var. roseum |
Name authority | Wilson: Bryol. Brit., 19. (1855) | Warnstorf: in H. G. A. Engler, Pflanzenr. 51[III]: 105. (1911) |
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