Grimmia hartmanii

Schimper

Syn. Musc. Eur., 214. 1860,.

Treatment appears in FNA Volume 27. Treatment on page 251. Mentioned on page 227, 248, 256, 258.

Plants in ascending, dichotomously branched patches, green. Stems 2–8 cm, central strand absent. Leaves slightly contorted with often secund apices when dry, distal leaves usually falcate-secund when moist, broadly lanceolate, tapering to an acuminate apex, 2.5–4.5 × 0.4–0.6 mm, keeled, margins usually recurved on one side, awns very short, denticulate, costa firm, projecting on abaxial side; basal juxtacostal laminal cells short to long-rectangular, slightly sinuose, thick-walled; basal marginal laminal cells quadrate, thickened transverse walls; medial laminal cells quadrate to short-rectangular, slightly sinuose, thick-walled; distal laminal cells 1-stratose, margins 2-stratose. Gemmae in clusters, mulberry or raspberry-shaped, brown, borne on leaf apices, usually present. Sexual condition dioicous. [Seta straight to flexuose, 3–4 mm. Capsule extremely rare, exserted, yellowish green, clavate-obloid, smooth, exothecial cells thick-walled, annulus present, operculum rostrate, peristome teeth orange, deeply split, perforated distally, papillose. Calyptra mitrate.]


Habitat: Shaded boulders, especially granite, in woodlands
Elevation: low to moderate elevations (100-1500 m)

Distribution

V27 346-distribution-map.gif

P.E.I., Que., Utah, Vt., Eurasia, n Africa

Discussion

Grimmia hartmanii is principally a lowland species, occurring in the mountains up to 1500 m. With the separation of G. anomala from it, G. hartmanii is much less common in North America than was previously thought. It is known principally from the Northeast. Although it is usually found in densely shaded habitats, in areas with high humidity it can establish itself in exposed sites. It more closely resembles some species of Racomitrioideae than it does species of its own genus, but it may be recognized by the usually spreading falcate-secund distal leaves, the very small awns, and the terminal clusters of brown gemmae, which are conspicuous and usually present. Capsules are extremely rare, and are unknown in North America.

Selected References

None.

Lower Taxa

None.
... more about "Grimmia hartmanii"
deciduous +  and persistent +
well-defined +
differentiated +
Roxanne I. Hastings +  and Henk C. Greven +
Schimper +
only rarely longer +
not papillose +
denticulate +
sinuous +  and straight to sometimes +
sinuose-nodulose;quadrate;elongate +
oblate;elongate +
divided +
undifferentiated +
plicate +  and smooth +
less +  and 1/2 +
not papillose +
mitrate +  and cucullate +
small;medium +
pendulous +  and cernuous +
striate +  and smooth +
rarely ventricose ovoid;obloid rarely globose or cylindric +
thin +  and thick +
thick-walled +  and thin-walled +
quadrate +  and rectangular +
excurrent;percurrent;excurrent +
subpercurrent +
reniform +, elliptical +  and terete +
usually not markedly larger +
1-stratose +  and multistratose +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
keeled +, tapering +  and lanceolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
P.E.I. +, Que. +, Utah +, Vt. +, Eurasia +  and n Africa +
low to moderate elevations (100-1500 m) +
reproduction +  and asexual +
dioicous +  and sexual +
Shaded boulders, especially granite, in woodlands +
papillose +, mammillose +  and smooth +
thick-walled +  and sinuose +
specialized +
dioicous +, autoicous +  and sexual +
keeled +, lanceolate +  and ovatelanceolate +
thick-walled +  and sinuose +
quadrate +  and short-rectangular +
thick-walled +  and sinuose +
thick-walled +  and sinuose +
rostrate;conic;rostrate;conic;mammillate +
not +  and enlarged +
not +  and differentiated +
lanceolate;linear +
Syn. Musc. Eur., +
straight +
sigmoid +  and arcuate +
papillose +  and smooth +
arcuate;cygneous +
short to long +
ornamented +  and smooth +
globose +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
muticous;long-awned +
Dryptodon +  and Hydrogrimmia +
Grimmia hartmanii +
Grimmia subg. Rhabdogrimmia +
species +