Schistidium trichodon

(Bridel) Poelt

Svensk Bot. Tidskr. 47: 253. 1953,.

Basionym: Grimmia trichodon Bridel Bryol. Univ. 1: 171. 1826
Treatment appears in FNA Volume 27. Treatment on page 225. Mentioned on page 207, 209, 211.

Plants in open tufts or extensive mats, black, dark olivaceous, or brownish-olivaceous. Stems 1.8–12 cm, central strand weak or absent. Leaves usually somewhat curved, rarely secund, ovate-lanceolate, sharply keeled distally, 1.7–2.7 mm, 1-stratose; margins usually recurved throughout and denticulate distally, 1-stratose or 2-stratose; apices acute; costa percurrent or excurrent as a short, denticulate, weakly decurrent awn, abaxial surface usually weakly papillose; basal marginal cells quadrate or short-rectangular, sometimes trigonous; distal laminal cells mostly short-rectangular, 8–10 µm wide, usually trigonous, sinuose. Sexual condition autoicous. Capsule red-brown, cylindric to short-cylindric, rarely cupulate, 0.7–1.2 mm, sometimes ribbed when dry; columella persistent within capsule; exothecial cells mainly isodiametric, sometimes mixed with short-elongate cells, thin-walled, trigonous; stomata present; peristome erect or ascending, often twisted inwards and overlapping distally, forming a dome, 400–700 µm, red, finely papillose, rarely with a few narrow slits. Spores 9–13(–19) µm, granulose or nearly smooth.


Phenology: Capsules mature late spring to early summer.
Habitat: Usually on calcareous rock (collected once on acidic rock in Washington State), open to shaded habitats
Elevation: low to high elevations (0-3500 m)

Distribution

V27 309-distribution-map.gif

B.C., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Que., Yukon, Alaska, Colo., Mont., Wash., Eurasia.

Discussion

The habitat, almost always on calcareous rock, its black or dark olivaceous color, the lack of long awns, the long, often domed peristome, and the persistence of the columella within the capsule make Schistidium trichodon a distinctive species.

Selected References

None.

Lower Taxa

None.
... more about "Schistidium trichodon"
Terry T. McIntosh +
(Bridel) Poelt +
Grimmia trichodon +
B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Que. +, Yukon +, Alaska +, Colo. +, Mont. +, Wash. +  and Eurasia. +
low to high elevations (0-3500 m) +
Usually on calcareous rock (collected once on acidic rock in Washington State), open to shaded habitats +
Capsules mature late spring to early summer. +
Svensk Bot. Tidskr. +
Schistidium trichodon +
Schistidium +
species +