Pseudephemerum nitidum

(Hedwig) Loeske

Stud. Morph. Laubm., 75. 1910,.

Basionym: Phascum nitidum Hedwig Sp. Musc. Frond., 19. 1801
Synonyms: Phascum axillare Smith Pleuridium axillare (Smith) Lindberg Pleuridium nitidum (Hedwig) Rabenhorst
Treatment appears in FNA Volume 27. Treatment on page 467.

Stem-leaves erect-spreading, lanceolate, to 1.8 mm at stem tip, base ovate, margins plane, entire, serrulate at the flat apex. Seta 1 (–2), short, erect. Capsule pale-brown, 0.5–0.65 mm, ovoid with a short point, smooth, exothecial cells hyaline, quadrate, stomata only on proximal part of capsule. Calyptra 0.3–0.4 mm.


Phenology: Capsules mature Nov.
Habitat: Damp soil, silt hammocks in grassy areas near river banks
Elevation: low to moderate elevations

Distribution

V27 678-distribution-map.gif

B.C., Oreg., Mexico, South America, Europe, Asia (Assam), Asia (Japan), Asia (Nepal), Africa (Congo), Africa (Kenya), Africa (Rwanda), Africa (Uganda), Africa (Zaire), Indian Ocean Islands (Madagascar), Pacific Islands (New Zealand), Australia (Tasmania)

Discussion

This species is readily recognized by the lax and undifferentiated leaf cells, and the serrulate leaf tips. Vegetatively, it is superficially similar to Pohlia, Bryum, or Leptobryum species by the thin-walled laminal cells and the serrated leaf apices, but the rough papillose rhizoids of these genera distinguish them from Pseudephemerum nitidum. E. Nyholm (1986+) reported asexual reproduction of P. nitidum by spherical gemmae. Pseudephemerum nitidum is newly reported from Oregon and Mexico from similar habitats (Yip K. L. 2002). The previous reports of this species in Canada could be verified only from a specimen from Richmond, British Columbia (Schofield 22437, UBC, WTU). A Nova Scotia report could not be confirmed after re-examination of the reported specimens (Yip 1998).

Selected References

None.

Lower Taxa

None.
... more about "Pseudephemerum nitidum"
forming a marginal border +  and not differentiated +
Kwok Leung Yip +
(Hedwig) Loeske +
rectangular +
Phascum nitidum +
cucullate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
cleistocarpous +
erect;inclined or pendulous +
long-exserted +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.065 cm0.65 mm <br />6.5e-4 m <br />) +
subpercurrent +
shortrectangular +  and isodiametric +
synoicous +  and sexual +
B.C. +, Oreg. +, Mexico +, South America +, Europe +, Asia (Assam) +, Asia (Japan) +, Asia (Nepal) +, Africa (Congo) +, Africa (Kenya) +, Africa (Rwanda) +, Africa (Uganda) +, Africa (Zaire) +, Indian Ocean Islands (Madagascar) +, Pacific Islands (New Zealand) +  and Australia (Tasmania) +
low to moderate elevations +
indeterminate +
Damp soil, silt hammocks in grassy areas near river banks +
0 cm0 mm <br />0 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
erect-spreading +
lanceolate +
curved +  and straight +
reflexed-recurved +
lanceolate +
serrulate +  and entire +
conic +  and short-rostrate +
with a longer , broader sheathing base +  and differentiated +
on short branches +  and axillary +
Capsules mature Nov. +
filamentous +
Stud. Morph. Laubm., +
yellow;orange reddish-brown brown or reddish purple +
elongate +
globose +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Phascum axillare +, Pleuridium axillare +  and Pleuridium nitidum +
Pseudephemerum nitidum +
Pseudephemerum +
species +
specialized +
synoicous +, paroicous +, autoicous +, dioicous +  and sexual +
plant +  and gregarious +
small +  and medium-sized +