Sphagnum contortum

Schultz

Prodr. Fl. Starg. Suppl., 64. 1819,.

Treatment appears in FNA Volume 27. Treatment on page 80. Mentioned on page 78, 84, 98.

Plants moderate to small-sized, weak-stemmed to spawling; green, yellow-green to golden brown; capitulum usually large and flat with curved branches; green, yellow-green, or golden brown. Stems pale green to light-brown, rarely dark-brown; superficial cortex of 2–3 layers of enlarged, thin-walled cells. Stem-leaves triangular-lingulate to lingulate, 0.7–1.4 mm; apex rounded-obtuse and weakly denticulate; hyaline cells nonseptate, mostly efibrillose, and, if porose, with more pores per cell on the concave surface (3–6) than on the convex surface (0–2). Branches somewhat curved, leaves spreading. Branch fascicles with 2–3 spreading and 2–3 (4) pendent branches. Branch leaves ovate to ovatelanceolate, 1.2–2 mm; subsecund; hyaline cells with numerous tiny pores in a continuous line along the commissures on the convex surface, no or scattered pores on the concave surface. Sexual condition dioicous. Capsule exserted, with scattered pseudostomata. Spores 22–28 µm; papillose on both surfaces; proximal laesurae more than 0.5 spore radius.


Habitat: Very minerotrophic, sometimes found in slightly basic mires, intolerant of shade
Elevation: low to moderate elevations

Distribution

Alta., B.C., Nfld. and Labr. (Nfld.), N.S., Ont., Que., Alaska, Calif., Colo., Conn., Idaho, Ill., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., Vt., Wash., W.Va., Wis., Eurasia

Discussion

Sporophytes are rare in Sphagnum contortum. This species is often associated with S. warnstorfii, S. centrale, Campylium stellatum, and Calliergonella cuspidata. The relatively small size, curved capitulum branches, and loosely spreading, subsecund branch leaves separate this species along with S. subsecundum. See also discussion under 61. S. platyphyllum.

Selected References

None.

Lower Taxa

None.
... more about "Sphagnum contortum"
denticulate;rounded-obtuse +
Cyrus B. McQueen† +  and Richard E. Andrus +
Schultz +
Subsecunda +
differentiated +
curved;curved +
ratio +, length +  and width +
ovate +  and ovatelanceolate +
larger +  and smaller +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pendent +  and spreading +
2 +  and 3 +
more slender +
differentiated +
porose +, efibrillose +  and thin-walled +
alternating +
strengthened +
exposed +  and visible +
nonornamented +
rectangular--shaped +, rhomboid +  and s-shaped +
enlarged +
fibrillose +
spherical +
monoicous +, dioicous +  and sexual +
Alta. +, B.C. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, Que. +, Alaska +, Calif. +, Colo. +, Conn. +, Idaho +, Ill. +, Ind. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, Vt. +, Wash. +, W.Va. +, Wis. +  and Eurasia +
low to moderate elevations +
dioicous +  and sexual +
conspicuous +
isophyllous +, hemiisophyllous +  and anisophyllous +
Very minerotrophic, sometimes found in slightly basic mires, intolerant of shade +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
triangular-lingulate;lingulate +
inconspicuous +  and conspicuous +
dioicous +  and sexual +
Elliptical (?) +  and Round (?) +
Prodr. Fl. Starg. Suppl., +
short-necked +, thin-walled +  and efibrillose +
tetrahedral +
septate +, porose +  and efibrillose +
ovate;lingulate +
dark-brown;pale green;light-brown +
differentiated +
concave +  and convex +
Cavifolia +, Comatosphagnum +, Cyclophylla +  and Sphagnum sect. Hemitheca +
Sphagnum contortum +
Sphagnum sect. Subsecunda +
species +
swollen +
round to elliptical +
yellow-green +  and golden brown +
erect +  and prostrate +
moderate +  and small-sized +