Didymodon rigidulus var. subulatus

(Thériot & E. B. Bartram) R. H. Zander

Cryptog. Bryol. Lichénol. 2: 395. 1981,.

Basionym: Didymodon mexicanus var. subulatus Thériot & E. B. Bartram Bryologist 29: 1, plate 1. 1926
Treatment appears in FNA Volume 27. Treatment on page 544. Mentioned on page 543, 561.

Stem-leaves appressed to weakly spreading when dry, longlanceolate, evenly broadened, long-oval; costa excurrent as a subula; proximal cells rectangular; distal laminal cells smooth, with quadrate lumens, lamina 2-stratose in distal 1/2–3/4; gemmae absent. Peristome teeth short, rudimentary, of 16 oval teeth with 1–2 (–4) articulations.


Phenology: Capsule maturity unknown.
Habitat: Rocks, ledges, soil, canyons
Elevation: moderate to high elevations (1000-2000 m)

Distribution

V27 777-distribution-map.gif

Ariz., Tex., Mexico (Distrito Federal), Mexico (Michoacán), Mexico (Puebla), Mexico (Querétaro), Mexico (Sonora)

Discussion

Variety subulatus is similar to var. icmadophilus in leaf shape and most other characters, and intergrades occur. It may be regarded as a somewhat distinctive geographical variant. The variety phenocopies Grimmia hamulosa, which differs by the grimmiaceous peristome, homogeneous costal section, and more robust habit.

Selected References

None.

Lower Taxa

None.

"um" is not declared as a valid unit of measurement for this property."um" is not declared as a valid unit of measurement for this property.

quadrate +  and elongate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
channeled +, concave +  and long-triangular +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
of 1-2 rows +  and differentiated +
Acute (?) +  and Subulate (?) +
Richard H. Zander +
(Thériot & E. B. Bartram) R. H. Zander +
weak +  and strong +
ovate +  and crescent--shaped +
papillose +  and smooth +
usually slightly wider +
differentiated +
Didymodon mexicanus var. subulatus +
obovoid +
cucullate +
stegocarpous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
monoicous +, dioicous +  and sexual +
flat to bulging +
thin;thick +
1 (?) +  and 10 (?) +
hexagonal +
differentiated +
tomentose +  and bare +
tapering +  and channeled +
widened +
quadrate +  and rectangular +
occasionally weakly dentate or crenulate +  and entire +
subquadrate;hexagonal or rounded-angular occasionally shortly rectangular or rhomboid +
Ariz. +, Tex. +, Mexico (Distrito Federal) +, Mexico (Michoacán) +, Mexico (Puebla) +, Mexico (Querétaro) +  and Mexico (Sonora) +
moderate to high elevations (1000-2000 m) +
differentiated +
multicellular +
occasional +
Ovate (?) +  and Elliptic (?) +
Rocks, ledges, soil, canyons +
yellow +  and orange-red or red +
long-ligulate +  and monomorphic +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
not +, spreading +, appressed-incurved +  and weakly spreading +
channeled;ovatelanceolate;keeled +
ovate +, keeled +  and curled +
reduced +
specialized +
dioicous +  and sexual +
quadrate +
short-conic;long-conic +
photosynthetic +
lateral +  and terminal +
lateral +  and terminal +
twisted +, cleft +  and perforated +
red-orange +  and yellow +
0-740 um +  and occasionally absent +
0-740 um-triangular +  and long-triangular +
Capsule maturity unknown. +
1 (?) +  and 2 (?) +
Cryptog. Bryol. Lichénol. +
straight +
yellowish;reddish-brown +
elongate +
0.7 cm7 mm <br />0.007 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2 +  and 1 +
yellow +, red-orange +, red +  and laminal +
appressed;weakly spreading +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Barbula rigidula +
Didymodon rigidulus var. subulatus +
Didymodon rigidulus +
variety +
elliptic;cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
rudimentary +
red +  and yellow +
specialized +
thin +  and evenly thickened +
stemless +  and perigoniate +