Grimmia serrana

J. Muñoz

Shevock & D. R. Toren, J. Bryol. 24: 143, figs. 1a–f. 2002,.

Treatment appears in FNA Volume 27. Treatment on page 246. Mentioned on page 228, 247, 258.

Plants in flat patches, olivaceous. Stems to 3 cm. Leaves ovatelanceolate from an ovate base, 2.5–3.5 × 0.6–0.7 mm, both margins plane, costa-like intermarginal bands 2–4 (–5) -stratose, awn to 1 mm, not decurrent, narrowly attached, acuminate, costa narrow proximally; basal juxtacostal laminal cells short to long-rectangular, sinuose, thick lateral-walled, dense; basal marginal laminal cells quadrate to short-rectangular, sinuose, thick lateral-walled, not hyaline; medial laminal cells quadrate, slightly sinuose, thick-walled; distal laminal cells 1–3-stratose, oblate to rectangular, thick-walled. Perichaetial leaves enlarged. Seta straight to slightly arcuate, to 3.5 mm. Capsule occasionally present, exserted, pale-yellow, ovoid, exothecial cells oblong, thin-walled, stomata absent, annulus of 1–2 rows of quadrate, thick-walled cells, operculum short straight, peristome fully developed, not perforate, not split. Calyptra cucullate.


Habitat: Humid to dry areas, exposed granite, metamorphic rock, metavolcanic rocks and basalt, montane woodlands
Elevation: moderate elevations (700-1400 m)

Discussion

According to the original description, Grimmia serrana is known only from “localities along the western slope of the Sierra Nevada and two occurrences in the northern Coast Range.” Despite its limited distribution, H. C. Greven (2003) found it to be quite common in the area. With its thick, concave leaves with plane margins and flat costa, G. serrana is best placed in subg. Litoneuron. This is further supported by a number of other features shared by, but not unique to, all members of that subgenus, including a well-developed stem central strand, dioicous sexuality, and long-exserted capsule with a multi-layered, thick-walled annulus. Grimmia serrana is most readily identified by a prominent, costa-like, multi-layered band of cells that run along the laminal margin distally and become submarginal proximally. This inflated band is unique to this species and readily separates it from all other members of subg. Litoneuron. As stated by Muñoz et al., G. serrana is most likely to be confused with G. ovalis. Both are robust species with ovate-lanceolate leaves from an ovate base. However, the prominent intermarginal bands of G. serrana will readily separate these species.

Selected References

None.

Lower Taxa

None.
... more about "Grimmia serrana"
deciduous +  and persistent +
well-defined +
differentiated +
Roxanne I. Hastings +  and Henk C. Greven +
J. Muñoz +
attached +
only rarely longer +
not papillose +
acuminate +  and not decurrent +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
sinuous +  and straight to sometimes +
sinuose-nodulose;quadrate;elongate +
oblate;elongate +
lateral-walled +  and sinuose +
undifferentiated +
plicate +  and smooth +
less +  and 1/2 +
not papillose +
cucullate +
small;medium +
sulcate +  and smooth +
pendent +  and erect +
striate +  and smooth +
thin +  and thick +
thick-walled +
quadrate +
excurrent;percurrent;excurrent +
subpercurrent +
reniform +, elliptical +  and terete +
usually not markedly larger +
thick-walled +  and 1-3-stratose +
moderate elevations (700-1400 m) +
reproduction +  and asexual +
dioicous +  and sexual +
Humid to dry areas, exposed granite, metamorphic rock, metavolcanic rocks and basalt, montane woodlands +
papillose +, mammillose +  and smooth +
lateral-walled +  and sinuose +
specialized +
dioicous +, autoicous +  and sexual +
2.5mm;3.5mm +
ovatelanceolate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
1;multistratose +
thick-walled +  and sinuose +
thick-walled +  and sinuose +
thick-walled +  and sinuose +
rostrate;conic;rostrate;conic;mammillate +
not +  and differentiated +
lanceolate;linear +
Shevock & D. R. Toren, J. Bryol. +
straight +  and slightly arcuate +
sigmoid +  and arcuate +
papillose +  and smooth +
short to long +
0 cm0 mm <br />0 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
ornamented +  and smooth +
globose +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
muticous;long-awned +
Dryptodon +  and Hydrogrimmia +
Grimmia serrana +
Grimmia subg. Litoneuron +
species +