familyMniaceae
genusMnium

Mnium hornum

Hedwig

Sp. Musc. Frond., 188. 1801.

Treatment appears in FNA Volume 28. Treatment on page 226. Mentioned on page 224.

Plants 1.5–5 (–8) cm. Stems red or brown. Leaves green, yellowish, or occasionally dark green, slightly contorted, usually coiled and twisted when dry, sometimes to one side of stem, narrowly elliptic, narrowly ovate-elliptic, or ovatelanceolate, 3–6 mm, proximal stem-leaves narrowly triangular; base short-decurrent; margins pale-brown, 2-stratose, toothed to below mid leaf, sometimes to near base, teeth paired, large, sharp; apex acute or acuminate, apiculate or cuspidate, cusp sometimes toothed; costa ending well below apex or occasionally percurrent, distal abaxial surface strongly toothed, adaxial surface occasionally toothed; medial laminal cells ± isodiametric or short-elongate, (15–) 17–26 (–30) µm, slightly smaller towards margins, not in diagonal rows, sometimes in longitudinal rows, not or weakly collenchymatous, blue postmortal color absent; marginal cells linear, in (2–) 3–4 rows. Sexual condition dioicous. Seta single. Capsule pale-brown, 3–5 mm; operculum conic-mammillate, rarely short-rostrate; exostome yellowish-brown. Spores 30–35 µm.


Phenology: Capsules mature summer.
Habitat: Banks along streams, shorelines, cliff faces on moist, sandy soil, humus
Elevation: low to moderate elevations

Distribution

V28 358-distribution-map.gif

Greenland, N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Ala., Colo., Conn., Del., Fla., Ga., Ill., Iowa, Ky., Maine, Md., Mass., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., South America, Europe, Asia, Africa

Discussion

Mnium hornum is one of the most distinctive members of the genus. The long, narrow leaves and strongly toothed abaxial costae with teeth of 1(–3) cells are diagnostic.

Selected References

None.

Lower Taxa

None.
... more about "Mnium hornum"
blackish +, orange-yellow +, reddish-brown +, yellowish-brown +, yellowish green +, red +, brown +  and yellow +
cuspidate +  and apiculate +
Acuminate (?) +  and Acute (?) +
Terry T. McIntosh +  and Steven G. Newmaster +
Hedwig +
short-decurrent +
red +  and yellowish +
long-decurrent +
cucullate +
horizontal;pendent +
oblong-cylindric +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
undifferentiated +
2 (?) +  and 1 (?) +
nodulose +
ending well before apex +  and subpercurrent +
toothed +
Greenland +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Ala. +, Colo. +, Conn. +, Del. +, Fla. +, Ga. +, Ill. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. +, South America +, Europe +, Asia +  and Africa +
low to moderate elevations +
brown +  and yellowish +
yellowish-brown +
lanceolate-acuminate +
Banks along streams, shorelines, cliff faces on moist, sandy soil, humus +
twisted +  and coiled +
crowded +  and distant +
dark green +, yellowish +  and green +
ovatelanceolate +, ovate-elliptic +  and elliptic +
larger +  and small +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
dioicous +  and sexual +
rhomboidal +  and short-linear +
short-elongate +  and isodiametric +
short-rostrate +  and conic-mammillate +
Capsules mature summer. +
Sp. Musc. Frond., +
smaller +  and larger +
flexuose +  and straight +
elongate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spheric +
not dendroid +, branched +  and simple +
brown +  and red +
Mnium hornum +
species +
open;compact +