Rhizomnium andrewsianum

(Steere) T. J. Koponen

Ann. Bot. Fenn. 5: 143. 1968.

Basionym: Mnium andrewsianum Steere Bryologist 61: 175, figs. 1–12. 1958
Treatment appears in FNA Volume 28. Treatment on page 238. Mentioned on page 218.
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Plants 1–3 (–4) cm. Stems dark red to reddish-brown or rarely black when old; micronemata absent. Leaves reddish, reddish-brown, or sometimes yellow-green or with golden hue, slightly to moderately contorted when dry, orbicular, broadly elliptic, or occasionally obovate, (1–) 1.8–2.4 (–3.8) mm; margins reddish, brownish, or rarely green, 1-stratose; apex rounded or occasionally retuse, not apiculate; costa subpercurrent or rarely weakly percurrent; medial laminal cells short-elongate or sometimes ± isodiametric, 45–65 (–80) µm, collenchymatous, walls pitted; marginal cells rhomboidal or rectangular, in 1–2 (–3) rows. Sexual condition dioicous. Seta 1.5–2 cm. Capsule elliptic, 1.2–2 mm; operculum conic; exostome yellow, lamellae 18+. Spores 25–30 µm.


Phenology: Capsules mature summer.
Habitat: Wet areas (depressions) in tundra
Elevation: low elevations

Distribution

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Greenland, Alta., Nfld. and Labr., N.W.T., Nunavut, Yukon, Alaska, Europe, Asia

Discussion

Rhizomnium andrewsianum is characterized by diminutive plants with small, reddish to reddish brown, erect leaves, sometimes resembling species of leafy liverworts, especially when mixed with other mosses. The stems are often sinuate at maturity. The leaves are arched with the apex folded upwards towards the stem and margins reflexed when dry, and more or less erect along the stem when moist.

Selected References

None.

Lower Taxa

None.
... more about "Rhizomnium andrewsianum"
blackish +, orange-yellow +, reddish-brown +, yellowish-brown +, yellowish green +, red +, brown +  and yellow +
retuse +  and rounded +
Terry T. McIntosh +  and Steven G. Newmaster +
- Steere T. J. Koponen +
long-decurrent +
Mnium andrewsianum +
cucullate +
yellowish-brown +  and yellow +
horizontal;pendent +
cylindric +, oblong +, subglobose +, ovate +  and elliptic +
0.12 cm1.2 mm <br />0.0012 m <br /> - 0.2 cm2 mm <br />0.002 m <br /> +
undifferentiated +
2 +  and 1 +
nodulose +
subpercurrent +
toothed +
Greenland +, Alta. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Yukon +, Alaska +, Europe +  and Asia +
low elevations +
yellowish-brown +  and yellow +
lanceolate-acuminate +
Wet areas - depressions in tundra +
crowded +  and distant +
0.7 cm7 mm <br />0.007 m <br /> - 1.3 cm13 mm <br />0.013 m <br /> +
with golden hue , slightly to moderately contorted when dry , orbicular , broadly elliptic or occasionally obovate , , - 1-1.8-2.4 - -3.8 mm +, yellow-green +, reddish-brown +  and reddish +
erect-spreading +
orbicular +, elliptic +, obovate +  and undulate +
larger +  and small +
0.1 cm1 mm <br />0.001 m <br /> - 0.7 cm7 mm <br />0.007 m <br /> +
green +, brownish +  and reddish +
dioicous +  and sexual +
rectangular +  and rhomboidal +
Capsules mature summer. +
Ann. Bot. Fenn. +
smaller +  and larger +
pale +, orange +  and reddish-brown +
flexuose +  and straight to somewhat +
elongate +
1.5 cm15 mm <br />0.015 m <br /> - 2 cm20 mm <br />0.02 m <br /> +
spheric +
not dendroid +  and simple +
dark red +  and reddish-brown or rarely black +
arching +  and erect +
sinuate +
Rhizomnium andrewsianum +
Rhizomnium +
species +
blunt +  and sharp +
3 cm30 mm <br />0.03 m <br /> - 4 cm40 mm <br />0.04 m <br /> +