Sphagnum isoviitae

Flatberg

J. Bryol. 17: 2, figs. 1, 2. 1992,.

Treatment appears in FNA Volume 27. Treatment on page 68. Mentioned on page 63, 66, 67.

Plants moderate-sized and moderately weak-stemmed to moderately stiff; green, brownish green to brown; capitulum flattopped and 5-radiate, terminal bud often visible. Stems pale green, rarely with red coloration, superficial cortex of 2 layers of moderately to well differentiated cells. Stem-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 and somewhat tapered, usually 5-ranked, leaves not greatly elongated at branch distal end. Branch 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. Branch leaves narrowly ovatelanceolate, 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. Spores 24–33 µm; finely papillose on the superficial surface.


Habitat: 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 moderate elevations

Distribution

V27 43-distribution-map.gif

Alta., Nfld. and Labr. (Nfld.), N.S., Que., Conn., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., Vt., Va., W.Va., Europe

Discussion

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.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number.

... more about "Sphagnum isoviitae"
acute;apiculate +
Cyrus B. McQueen† +  and Richard E. Andrus +
Flatberg +
differentiated +
broad +  and narrow +
fascicles +  and 5-ranked +
more slender and delicate +
ratio +, length +  and width +
undulate +  and ovatelanceolate +
pendent +  and spreading +
2 +  and 3 +
slender +
reddish +  and green +
differentiated +
chlorophyllous +  and efibrillose +
alternating +
strengthened +
well-enclosed +
nonornamented +
dioicous +  and sexual +
triangular +  and trapezoidal +
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 +
Alta. +, Nfld. and Labr. (Nfld.) +, N.S. +, Que. +, Conn. +, Ind. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, Vt. +, Va. +, W.Va. +  and Europe +
low to moderate elevations +
monoicous +, dioicous +  and sexual +
conspicuous +
isophyllous +, hemiisophyllous +  and anisophyllous +
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 +
spreading +  and appressed +
triangular;lingulate-triangular +
inconspicuous +  and conspicuous +
tetrahedral +
septate +, porose +  and efibrillose +
triangular;lingulate +
usually smaller +
pale green +
differentiated +
with a few to numerous pores or pseudopores +  and porose +
concave +  and convex +
Sphagnum sect. Mollusca +
Sphagnum isoviitae +
Sphagnum sect. Cuspidata +
species +
swollen +
brownish green +  and brown +