Gemmabryum demaretianum

(Arts) J. R. Spence

Phytologia 89: 111. 2007.

Basionym: Bryum demaretianum Arts J. Bryol. 17: 263, figs. 1–3. 1992
Treatment appears in FNA Volume 28. Treatment on page 138. Mentioned on page 137.

Plants small, green or yellow-green, often with reddish tinge. Stems 0.4–1(–1.5) cm; rhizoids hyaline, pale yellowish brown, or red-brown. Leaves loosely set, ovate-lanceolate to ovate, weakly concave, 0.6–1.5(–2) mm; base not decurrent; margins plane to weakly revolute basally, entire to serrulate distally, limbidium absent or indistinct, of 1 or 2 rows of elongate, incrassate cells; apex acuminate; costa percurrent to short-excurrent, awn slender; alar cells similar to adjacent juxtacostal cells; proximal laminal cells gradually rectangular, 2–4:1; medial and distal cells 50–70(–80) × 12–20(–24) µm, 3–4:1. Specialized asexual reproduction by rhizoidal tubers, in clusters of 2–5 on short lateral rhizoids of main rhizoids at base of stem, yellow to orange-brown, pyriform, 80–150(–170) µm, cells 25–50 µm, smooth to slightly protuberant but not distinctly so. Sexual condition dioicous. Capsule unknown.

Habitat: Disturbed soil of agricultural fields, landscaped or disturbed sites
Elevation: low elevations (0-100 m)


V28 217-distribution-map.gif

Que., Ariz., Calif., Nev., N.Mex., c, w Europe.


The many medium-sized yellow to orange rhizoidal tubers in clusters on short rhizoids at the stem base are diagnostic of Gemmabryum demaretianum. In the flora area, this species is probably introduced.

Selected References


Lower Taxa

... more about "Gemmabryum demaretianum"
John R. Spence +
(Arts) J. R. Spence +
Bryum demaretianum +
Que. +, Ariz. +, Calif. +, Nev. +, N.Mex. +, c +  and w Europe. +
low elevations (0-100 m) +
Disturbed soil of agricultural fields, landscaped or disturbed sites +
Gemmabryum demaretianum +
Gemmabryum sect. Tuberibryum +
species +