Grimmia donniana

Smith in J. E. Smith et al.

in J. E. Smith et al., Engl. Bot. 18: plate 1259. 1804,.

Treatment appears in FNA Volume 27. Treatment on page 236. Mentioned on page 228, 229, 234, 237, 252.

Plants in dense cushions, dark green to almost black. Stems 0.8–1.2 (–1.5) cm, central strand present. Leaves oblong-lanceolate, 1–2.2 × 0.3–0.6 mm, keeled, not plicate, margins plane, awn 0.3–1.3 mm, costal transverse-section prominent, semicircular; basal juxtacostal laminal cells long-rectangular, straight, thin-walled (rarely somewhat thick-walled); basal marginal laminal cells long-rectangular, straight, thin-walled, typically hyaline; medial laminal cells short-rectangular, sinuose, thick-walled; distal laminal cells commonly 2-stratose, occasionally only 1-stratose, not bulging, marginal cells 2-stratose, not bulging. Sexual condition autoicous, perichaetial leaves not enlarged. Seta straight, 2–3 mm. Capsule usually abundantly present, exserted, pale yellowbrown, oblong, exothecial cells quadrate, thin-walled, stomata present, annulus of 2 rows of quadrate, thick-walled cells, operculum mammillate to rostellate, peristome present, fully-developed, perforated in distal half.


Habitat: Exposed, acidic granite and sandstone, forests, tundra
Elevation: moderate to high elevations (800-3700 m)

Distribution

V27 321-distribution-map.gif

Greenland, Alta., B.C., Nfld. and Labr. (Labr.), N.W.T., Que., Yukon, Alaska, Colo., Idaho, Maine, Mich., Mont., N.H., N.Y., Oreg., Utah, Wash., Wyo., Mexico, South America, Eurasia, Africa, Antarctic

Discussion

Grimmia donniana is widespread but relatively uncommon and sporadic along the front ranges of the Rocky Mountains from Alberta south to southern Utah and Colorado. West of the Rockies it is known from a few locations in central Washington, northern Idaho, and northern Oregon. It is rare at higher latitudes, with a few records from Alaska, the Yukon, Northwest Territories, and Greenland. There are three disjunct populations in eastern North America: one in Michigan, one in the New England states and southern Quebec, and one in Labrador. Most specimens reported from British Columbia (R. R. Ireland et al. 1987) actually represent G. alpestris. Grimmia donniana is usually recognized by: (1) leaves with plane margins and (2) a hyaline rather uniform basal lamina with long-rectangular, thin-walled cells. The leaves of G. montana, while often incurved distally, may also have plane margins. The latter species, however, has quadrate to short-rectangular basal marginal cells that have thick end-walls and are rarely hyaline. It is also dioicous and lacks stomata. Grimmia sessitana can also have leaves with plane margins, but often one margin is recurved. Its basal marginal laminal cells are rectangular, like those of G. donniana, but they have thick rather than thin walls and are typically not hyaline. The leaf cells of G. sessitana are most often bulging, mammillose; those of G. donniana are not.

Selected References

None.

Lower Taxa

None.
... more about "Grimmia donniana"
deciduous +  and persistent +
well-defined +
differentiated +
Roxanne I. Hastings +  and Henk C. Greven +
Smith in J. E. Smith et al. +
only rarely longer +
not papillose +
toothed +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
sinuous +  and straight to sometimes +
sinuose-nodulose;quadrate;elongate +
oblate;elongate +
divided +
Undefined subg. Guembelia +
undifferentiated +
plicate +  and smooth +
less +  and 1/2 +
not papillose +
mitrate +  and cucullate +
small;medium +
sulcate +  and smooth +
pale yellowbrown +
pendent +  and erect +
striate +  and smooth +
thin +  and thick +
thick-walled +
quadrate +
excurrent;percurrent;excurrent +
subpercurrent +
reniform +, elliptical +  and terete +
usually not markedly larger +
dark green to almost +
with at-least several marginal rows +  and 2-stratose +
1-stratose +  and 2-stratose +
Greenland +, Alta. +, B.C. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Que. +, Yukon +, Alaska +, Colo. +, Idaho +, Maine +, Mich. +, Mont. +, N.H. +, N.Y. +, Oreg. +, Utah +, Wash. +, Wyo. +, Mexico +, South America +, Eurasia +, Africa +  and Antarctic +
moderate to high elevations (800-3700 m) +
reproduction +  and asexual +
dioicous +, autoicous +  and sexual +
Exposed, acidic granite and sandstone, forests, tundra +
papillose +, mammillose +  and smooth +
specialized +
dioicous +, autoicous +  and sexual +
1mm;2.2mm +
keeled +  and oblong-lanceolate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
1;multistratose +
incurved +  and recurved +
thick-walled +  and sinuose +
short-rectangular +
thick-walled +  and sinuose +
thick-walled +  and sinuose +
mammillate;rostellate +
not +  and differentiated +
fully-developed +
lanceolate;linear +
in J. E. Smith et al., Engl. Bot. +
straight +
sigmoid +  and arcuate +
papillose +  and smooth +
short to long +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
ornamented +  and smooth +
globose +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
muticous;long-awned +
Dryptodon +  and Hydrogrimmia +
Grimmia donniana +
Grimmia subg. Guembelia +
species +
black;dark green to almost +