Sphagnum recurvum

P. Beauvois

Prodr. Aethéogam., 88. 1805,.

Synonyms: Sphagnum pentastichon Bridel Sphagnum pulchricoma Müller Hal. Sphagnum riparioides Warnstorf
Treatment appears in FNA Volume 27. Treatment on page 75. Mentioned on page 19, 63, 64, 66, 68, 73, 96.

Plants moderate-sized to robust, moderately stiff-stemmed, ± lax, but not compact; green to pale-yellow to yellowish-brown; capitulum typically strongly convex in open-grown forms, but flat and ± 5-radiate in shade-forms. Stem pale green to yellowish; superficial cortex of 2 layers of enlarged, thin-walled and well differentiated cells. Stem-leaves triangular, triangular-lingulate to lingulate, more than 0.8 mm, appressed, apex obtuse to broadly obtuse, erose to fimbriate; hyaline cells efibrillose and nonseptate. Branches straight and often tapering, often 5-ranked, leaves not much elongate at distal end of branches. Branch fascicles with 2 spreading and 2 pendent branches. Branch stems green, cortex enlarged with conspicuous retort cells. Branch leaves ovatelanceolate, 1.4–2 mm, straight; slightly undulate and sharply recurved; margins entire; hyaline cells on convex surface with 1 pore per cell at cell apex, concave surface with round wall-thinnings in the cell ends and angles; chlorophyllous cells triangular in transverse-section and well-enclosed on concave surface. Sexual condition dioicous. Spores 22–28 µm; papillose on both surfaces; proximal laesura more than 0.5 spore radius.


Phenology: Capsules mature late summer to early fall.
Habitat: Forming carpets in a variety of very poor to poor fen habitats, including sedge fens, pocosins, bay swamps
Elevation: low to moderate elevations

Distribution

Nfld. and Labr. (Nfld.), N.S., Ala., Ark., Conn., Del., Fla., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., S.C., Tenn., Tex., Vt., Va., W.Va., South America

Discussion

Sporophytes in Sphagnum recurvum are uncommon. This species is found exclusively in the New World. It has several strong characters that distinguish it from S. flexuosum, and the opinion of H. A. Crum (1997) that the two species are synonymous is rejected. See discussion under 30. S. flexuosum.

Selected References

None.

Lower Taxa

None.
... more about "Sphagnum recurvum"
fimbriate;obtuse;broadly obtuse +
Cyrus B. McQueen† +  and Richard E. Andrus +
P. Beauvois +
differentiated +
broad +  and narrow +
fascicles +  and 5-ranked +
more slender and delicate +
ratio +, length +  and width +
undulate +  and ovatelanceolate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pendent +  and spreading +
tapering +
slender +
differentiated +
chlorophyllous +, efibrillose +  and thin-walled +
alternating +
strengthened +
well-enclosed +
nonornamented +
dioicous +  and sexual +
triangular +
enlarged +
fibrillose +
differentiated +
spherical +
0 cm0 mm <br />0 m <br /> (?) +  and 0.2 cm2 mm <br />0.002 m <br /> (?) +
monoicous +, dioicous +  and sexual +
enlarged +
Nfld. and Labr. (Nfld.) +, N.S. +, Ala. +, Ark. +, Conn. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +, W.Va. +  and South America +
low to moderate elevations +
monoicous +, dioicous +  and sexual +
conspicuous +
isophyllous +, hemiisophyllous +  and anisophyllous +
open-grown +
Forming carpets in a variety of very poor to poor fen habitats, including sedge fens, pocosins, bay swamps +
triangular-lingulate;lingulate +
elongate +
inconspicuous +  and conspicuous +
Capsules mature late summer to early fall. +
Prodr. Aethéogam., +
tetrahedral +
septate +, porose +  and efibrillose +
triangular;lingulate +
usually smaller +
pale green;yellowish +
differentiated +
with a few to numerous pores or pseudopores +  and porose +
concave +  and convex +
Sphagnum pentastichon +, Sphagnum pulchricoma +  and Sphagnum riparioides +
Sphagnum recurvum +
Sphagnum sect. Cuspidata +
species +
swollen +
green +  and pale-yellow +