Micromitrium megalosporum

Austin

Musci Appalach., 11. 1870,.

Basionym: Ephemerum megalosporum (Austin) E. S. Salmon J. Linn. Soc., Bot. 34: 166. 1899
Synonyms: Nanomitrium megalosporum (Austin) E. Britton
Treatment appears in FNA Volume 27. Treatment on page 649. Mentioned on page 647, 648.

Plants scattered or gregarious in usually sparse protonemata, yellow-green to orangebrown. Stems less than 0.2 mm. Leaves erect or spreading, broadly ovatelanceolate and somewhat clasping at base, acuminate, 0.5–1.1 × 0.14–0.43 mm, margins usually ± incurved beyond the middle, entire proximally and distally entire to serrulate. Sexual condition synoicous. Capsule cleistocarpous or rarely dehiscing by a ring of differentiated cells distal to the equator, orangebrown, globose or slightly flattened, rarely broadly ovoid, with a short, broad apiculus; exothecial cells in 2 layers, stomates confined to distal half, sometimes absent. Spores fewer than 100, various shapes, proximal face only rarely concave, 55–83 × 37–67 µm, orangebrown.


Phenology: Capsules mature summer–winter, with some capsules persisting through spring with leaves intact or eroded.
Habitat: In sun or partial shade, unfertilized bare soil, sparsely vegetated turf
Elevation: low to moderate elevations (0-700 m)

Distribution

V27 956-distribution-map.gif

Ark., Conn., Fla., Ga., La., Maine, Md., Mich., Miss., Mo., N.J., N.C., Pa., Wis., West Indies (Cuba), e Asia (Japan), Africa (Cameroon)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Micromitrium megalosporum"
ecostate +  and costate +
acuminate +
multicellular +
Virginia S. Bryan +
Austin +
Ephemerum megalosporum +
0 +  and 2/3 +
torn +, lobed +, cucullate +  and mitrate +
0 cm0 mm <br />0 m <br /> (?) +  and 0.016 cm0.16 mm <br />1.6e-4 m <br /> (?) +
dehiscing +  and cleistocarpous +
0mm +  and 0.4mm +
ovoid +, flattened +  and globose +
thin-walled +
differentiated +
angled +, globose +  and reniform +
Ark. +, Conn. +, Fla. +, Ga. +, La. +, Maine +, Md. +, Mich. +, Miss. +, Mo. +, N.J. +, N.C. +, Pa. +, Wis. +, West Indies (Cuba) +, e Asia (Japan) +  and Africa (Cameroon) +
low to moderate elevations (0-700 m) +
In sun or partial shade, unfertilized bare soil, sparsely vegetated turf +
dioicous +, synoicous +  and sexual +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
spreading +  and erect +
acuminate +  and ovatelanceolate +
0.014 cm0.14 mm <br />1.4e-4 m <br /> (0.043 cm0.43 mm <br />4.3e-4 m <br />) +
distally entire +  and serrulate +
synoicous +  and sexual +
Capsules mature summer–winter, with some capsules persisting through spring with leaves intact or eroded. +
abundant +  and sparse +
swollen +  and elongate +
Musci Appalach., +
swollen +  and elongate +
black;brown;black;brown;red;orange +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
superficial +
Nanomitrium megalosporum +
Micromitrium megalosporum +
Micromitrium +
species +
yellow-green +  and orangebrown +
plant +  and gregarious +