Didymodon maximus

(Syed & Crundwell) M. O. Hill

J. Bryol. 11: 599. 1982,.

Basionym: Barbula maxima Syed & Crundwell J. Bryol. 7: 527. 1974,
Treatment appears in FNA Volume 27. Treatment on page 558. Mentioned on page 541, 557, 560.

Plants green to redbrown. Stems often more than 3 cm, central strand present. Stem-leaves appressed when dry, strongly recurved and keeled when moist, monomorphic, ovate-triangular, adaxially grooved along costa, 2–2.5 mm, base scarcely differentiated in shape to ovate, margins nearly plane to recurved at mid leaf, entire, apex broadly acute; costa percurrent to short-excurrent, not fragile, weakly tapering, widened pad of cells absent, adaxial costal cells elongate, 2–3 cells wide at mid leaf, guide cells in 1 layer; basal laminal cells differentiated medially, rectangular, walls thickened and often porose; distal laminal cells 13–15 µm wide, 1: 1, papillae usually present, simple, often large, 1–3 centered over lumens, lumens angular, walls irregularly thickened and often trigonous but trigones smaller than lumens, convex on both sides, 1-stratose. Specialized asexual reproduction absent. Sexual condition sterile in range of flora. Sporophytes unknown. Distal laminal KOH reaction dark red.


Habitat: Cliffs, outcrops, canyons, limestone, tundra meadow
Elevation: low to moderate elevations (20-1300 m)

Discussion

Didymodon maximus is rare and apparently disjunctive to the western British Isles (W. C. Steere and G. W. Scotter 1978).

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.

... more about "Didymodon maximus"
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 +
long-excurrent +  and short-excurrent +
Richard H. Zander +
(Syed & Crundwell) M. O. Hill +
weak +  and strong +
ovate +  and crescent--shaped +
papillose +  and smooth +
usually slightly wider +
ovate;differentiated +
differentiated +
Barbula maxima +
obovoid +
cucullate +
stegocarpous +
monoicous +, dioicous +  and sexual +
flat to bulging +
thin;thick +
1 (?) +  and 10 (?) +
hexagonal +
tomentose +  and bare +
percurrent +  and short-excurrent +
not fragile +
tapering +
quadrate +  and rectangular +
occasionally weakly dentate or crenulate +  and entire +
subquadrate;hexagonal or rounded-angular occasionally shortly rectangular or rhomboid +
Nunavut +, Alaska +  and w Europe +
low to moderate elevations (20-1300 m) +
differentiated +
multicellular +
occasional +
Cliffs, outcrops, canyons, limestone, tundra meadow +
yellow +  and orange-red or red +
grooved +  and monomorphic +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
ovate-triangular;keeled +
ovate +, keeled +  and curled +
reduced +
specialized +
dioicous +  and sexual +
occasionally trigonous +  and weakly strongly convex +
short-conic;long-conic +
photosynthetic +
widened +
1 +  and 3 +
lateral +  and terminal +
lateral +  and terminal +
twisted +, cleft +  and perforated +
red +, orange +  and yellow +
oblong +  and linear or long-triangular +
1 (?) +  and 2 (?) +
straight +
yellowish;reddish-brown +
elongate +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 +  and 1 +
yellow +, red-orange +, red +  and laminal +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Barbula sect. Acutae +, Barbula subsect. Acutiformes +, Barbula sect. Asteriscium +, Barbula sect. Fallaces +, Barbula subsect. Fallaciformes +, Barbula sect. Graciles +, Barbula sect. Rubiginosae +, Barbula sect. Vineales +, Barbula subsect. Vinealiformes +, Dactylhymenium +, Didymodon sect. Asteriscium +, Didymodon sect. Fallaces +, Didymodon sect. Graciles +, Didymodon sect. Vineales +, Geheebia +, Husnotiella +  and Trichostomopsis +
Didymodon maximus +
Didymodon +
species +
elliptic;cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
rudimentary +
sexual +  and asexual +
red +  and yellow +
trigonous +
stemless +  and perigoniate +