Plagiomnium undulatum

(Hedwig) T. J. Koponen

Ann. Bot. Fenn. 5: 146. 1968.

Basionym: Mnium undulatum Hedwig Sp. Musc. Frond., 195. 1801
Treatment appears in FNA Volume 28. Treatment on page 235. Mentioned on page 229, 230, 231.

Erect stems 1–10 cm, ± dendroid; sterile stems to 10 (–15) cm. Leaves dark green or yellow-green, contorted when dry, transversely undulate when moist, oblong-lingulate, lingulate, narrowly ligulate, or rarely narrowly elliptic, 6–10 (–14) mm; base long-decurrent; margins toothed to near base, teeth sharp, of 1 (or 2) cells; apex obtuse or rounded, occasionally acute, usually cuspidate, cusp toothed; costa excurrent; medial laminal cells elongate or short-elongate, (12–) 15–30 (–40) µm, slightly smaller near margins, occasionally in longitudinal rows, rarely in diagonal rows, collenchymatous, walls pitted or not; marginal cells linear, in (2–) 3–4 rows. Specialized asexual reproduction by stolonlike stems. Sexual condition dioicous. [Seta 1–4, yellow-green, dark red to blackish with age, 2–4 cm. Capsule pendent, oblong-cylindric, 2.5–3 mm, neck not distinct; operculum rostrate. Spores 30–35 µm].


Phenology: Capsules reportedly mature late spring–early summer.
Habitat: Shaded soil in urban settings
Elevation: low elevations

Discussion

Plagiomnium undulatum, likely an introduction from Europe, recently has been found in Vancouver and Victoria, British Columbia (S. Joya and T. T. McIntosh 2012), where it is well established at a few sites in shaded habitats over soil, especially along roadsides. The species probably has been overlooked because of superficial similarities to P. insigne, a fairly common urban moss in similar habitats; it may be present in other west coast cities. Sporophytes are not known from the flora area (descriptions of the sporophytes are from A. J. E. Smith 2004). The plants often produce subterranean and leafless stolonlike stems. For differences from the similar 1. P. carolinianum, see the discussion of that species.

Selected References

None.

Lower Taxa

None.
... more about "Plagiomnium undulatum"
blackish +, orange-yellow +, reddish-brown +, yellowish-brown +, yellowish green +, red +, brown +  and yellow +
Acute (?) +, Rounded (?) +  and Obtuse (?) +
Terry T. McIntosh +  and Steven G. Newmaster +
(Hedwig) T. J. Koponen +
long-decurrent +
Mnium undulatum +
cucullate +
yellowish-brown +  and yellow +
horizontal;pendent +
ovoid +, obovoid +, oblong-cylindric +, oblong +  and cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
undifferentiated +
nodulose +
subpercurrent +
toothed +
B.C. +  and Europe +
low elevations +
yellow +  and yellowish-brown +
brown +  and yellow +
lanceolate-acuminate +
Shaded soil in urban settings +
crowded +  and distant +
elliptic +  and contorted +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
yellow-green +  and dark green +
lingulate +, oblong-lingulate +  and undulate +
larger +  and small +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
yellow-green +  and green +
dioicous +  and sexual +
rhomboidal +  and linear +
short-elongate +  and elongate +
rostrate +  and conic-apiculate +
Capsules reportedly mature late spring–early summer. +
Ann. Bot. Fenn. +
smaller +  and larger +
blackish +, dark red +, orange +, greenish +, reddish +, brown +, yellow-green +  and yellow +
straight +  and flexuose +
multiple +  and single +
elongate +
1.2 cm12 mm <br />0.012 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spheric +
brownish +, yellow-green +  and green +
asexual +  and sterile +
0 cm0 mm <br />0 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Plagiomnium undulatum +
Plagiomnium +
species +
Not (?) +  and Pitted (?) +