Sphagnum riparium

Ångström

Öfvers. Kongl. Vetensk.-Akad. Förh. 21: 198. 1864,.

Treatment appears in FNA Volume 27. Treatment on page 75. Mentioned on page 62.

Plants stiff and upright, large; green to pale green to brownish, capitulum large and flat, with a conspicuous terminal bud. Stems pale green, superficial cortex of 3–4 layers of weakly differentiated cells. Stem-leaves triangular-lingulate, 1.2–1.4 mm; apex with a deep lacerate split; hyaline cells aporose, efibrillose and often septate. Branches unranked to rarely 5-ranked, branch leaves only weakly undulate, but sharply recurved at the apex, leaves not much elongated at distal end. Branch fascicles with 2 spreading and 2 pendent branches. Branch stem green, cortex enlarged with retort cells. Branch leaves ovatelanceolate; 2–2.6 mm; straight; weakly undulate but strongly recurved, hyaline cells on convex surface with very large irregular pores (formed from the confluence of several smaller pores) at the cell apex, concave surface with large round wall-thinnings in the cell angles; chlorophyllous cells triangular to trapezoidal in transverse-section, apex normally slightly exposed on concave surface. Sexual condition dioicous. Spores 22–28 µm; proximal surface noticeably papillose, distal surface smooth or with fewer papillae; proximal laesura more than 0.5 the length of the radius.


Habitat: Forming often extensive carpets in weakly minerotrophic mires
Elevation: low to moderate elevations

Distribution

Greenland, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Conn., Ind., Maine, Mass., Mich., Minn., Mont., N.H., N.J., N.Y., Ohio, Pa., Vt., Wash., Eurasia

Discussion

Sporophytes are uncommon in Sphagnum riparium. This species is typically very easily recognized in the field with its pale green color, strong terminal bud, and unranked branch leaves.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number.

... more about "Sphagnum riparium"
dioicous +  and sexual +
Cyrus B. McQueen† +  and Richard E. Andrus +
Ångström +
differentiated +
broad +  and narrow +
fascicles +, unranked +  and rarely 5-ranked +
more slender and delicate +
ratio +, length +  and width +
undulate +  and ovatelanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
pendent +  and spreading +
slender +
differentiated +
chlorophyllous +, septate +  and efibrillose +
alternating +
strengthened +
nonornamented +
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 +
Greenland +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Conn. +, Ind. +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, N.H. +, N.J. +, N.Y. +, Ohio +, Pa. +, Vt. +, Wash. +  and Eurasia +
low to moderate elevations +
monoicous +, dioicous +  and sexual +
conspicuous +
isophyllous +, hemiisophyllous +  and anisophyllous +
Forming often extensive carpets in weakly minerotrophic mires +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
triangular-lingulate +
in a few cases +  and entire +
inconspicuous +  and conspicuous +
few +  and numerous +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
lacerate +
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 riparium +
Sphagnum sect. Cuspidata +
species +
swollen +
green +  and pale green +