Plagiobryum zieri

(Dickson ex Hedwig) Lindberg

Öfvers. Kongl. Vetensk.-Akad. Förh. 19: 606. 1863.

Illustrated
Basionym: Bryum zieri Hedwig Sp. Musc. Frond., 182, plate 44, figs. 1–5. 1801 (as zierii)
Synonyms: Pohlia zieri (Hedwig) Schwägrichen
Treatment appears in FNA Volume 28. Treatment on page 153. Mentioned on page 11, 126.

Plants 0.8–2.5 cm, whitish or silvery green, usually with pink tinge. Stems 0.3–2 cm, innovations elongate, julaceous. Leaves of innovations appressed or imbricate, broadly ovate to nearly circular, concave, 0.7–1.3 × 0.4–0.8 mm; margins plane; apex acute, ending in small reflexed point; costa ending in or shortly before apex, in transverse-section abaxial stereid band usually 2 or 3 cells thick, occasionally absent, 2 or 3 adaxial cells in 1 layer; leaves on fertile shoots more narrowly ovate; proximal laminal cells 2–4: 1, walls firm; medial cells in older leaves rhomboidal or elongate-rhomboidal, 13–24 µm wide mid leaf, 2.5–5: 1, walls ± firm, cells lax and thin-walled distally. Capsule horizontal to pendulous, 4–14 mm, neck 0.9–2.5 times urn length; exostome yellow to yellowbrown, 0.8–0.9 times endostome length, distinctly papillose proximally. Spores separate at maturity, 28–40 µm, papillose, brown, yellowish-brown, or greenish brown.


Phenology: Capsules mature mid summer–early fall.
Habitat: Ledges, crevices of moist or wet cliff faces, near waterfalls, substrates including basalt, shale, limestone
Elevation: low to high elevations (0-3000 m)

Distribution

V28 245-distribution-map.gif

Greenland, Alta., B.C., Nfld. and Labr., N.W.T., N.S., Nunavut, Que., Yukon, Alaska, Colo., Idaho, Mont., Oreg., Vt., Wash., Wyo., Central America (Guatemala), Europe, Asia, Africa (South Africa)

Discussion

Plagiobryum zieri is a predominantly montane-alpine species that is disjunctively distributed between eastern and western North America. The species differs from P. demissum in the julaceous, whitish or silvery green plants that are usually suffused with tinges of pink. Plagiobryum demissum is invariably red or reddish brown, and the shoots are non-terete. The broadly ovate, flat-margined leaves of P. zieri also serve to identify the species. Sterile collections are more likely to be confused with Bryum argenteum, which is also silvery-green and has a similar leaf shape. However, plants of B. argenteum are smaller, have laminal cells firm to ± incrassate distally and quadrate proximally, lack pinkish coloration and occur in drier, often disturbed or nitrogen enriched habitats.

Selected References

None.

Lower Taxa

None.

"narrower" is not a number."narrow" is not a number.

... more about "Plagiobryum zieri"
Terry A. J. Hedderson +
(Dickson ex Hedwig) Lindberg +
reduced +
curved +  and straight +
decurrent +
Bryum zieri +
cucullate +
horizontal +  and pendulous +
long-exserted +
gibbous +  and clavate +
0.4 cm4 mm <br />0.004 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
thin-walled +
quadrate +  and long-rectangular +
appendiculate +
rudimentary +
short-excurrent +
hexagonal;rhomboidal +
Greenland +, Alta. +, B.C. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Que. +, Yukon +, Alaska +, Colo. +, Idaho +, Mont. +, Oreg. +, Vt. +, Wash. +, Wyo. +, Central America (Guatemala) +, Europe +, Asia +  and Africa (South Africa) +
low to high elevations (0-3000 m) +
hyaline;pale-yellow +
yellow +  and yellowbrown +
0.8-0.9 times endostome length +
Ledges, crevices of moist or wet cliff faces, near waterfalls, substrates including basalt, shale, limestone +
not +  and differentiated +
polyoicous +, monoicous +, dioicous +  and sexual +
0.7mm;1.3mm +
elongate-rhomboidal +, rhomboidal +, concave +, broadly ovate +  and nearly circular +
larger +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +  and 0.08 cm0.8 mm <br />8.0e-4 m <br /> (?) +
rhombic +  and rectangular +
short-rectangular +  and quadrate +
0.9-2.5 times urn length +
mammillate +  and short-conic +
lateral +  and terminal +
lateral +  and terminal +
diplolepidous-alternate +
Capsules mature mid summer–early fall. +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
differentiated +
smooth;papillose +
geniculate +  and cygneous +
Illustrated +
greenish brown +, yellowish-brown +  and brown +
adherent +
germinating +
not +  and julaceous +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Pohlia zieri +
Plagiobryum zieri +
Plagiobryum +
species +
narrow-lanceolate +
distinct +
straight +
specialized +
dioicous +, sexual +  and asexual +
sinuate +
thick;thin;thick +
silvery green +  and whitish +