Didymodon maschalogena

(Renauld & Cardot) Brotherus in H. G. A. Engler and K. Prantl

in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 234/235[I,3]: 1192. 1909,.

Basionym: Barbula maschalogena Renauld & Cardot Bull. Soc. Roy. Bot. Belgique 41(1): 53. 1905
Synonyms: Barbula michiganensis Steere Didymodon michiganensis (Steere) K. Saito
Treatment appears in FNA Volume 27. Treatment on page 558. Mentioned on page 541.

Plants green to glossy green. Stems to 2 cm, central strand present. Stem-leaves catenulate-incurved when dry, spreading and weakly keeled when moist, monomorphic, ovatelanceolate, adaxially grooved in distal third, 0.9–1.1 mm, base often but not always sharply differentiated in shape, ovate, margins narrowly to broadly recurved in proximal 1/3–1/2, entire, apex narrowly acute, abruptly acuminate, not fragile; costa percurrent to very shortly excurrent, tapering, widened pad of cells absent, adaxial costal cells elongate, 4 cells wide at mid leaf, guide cells in 1 layer; basal laminal cells little differentiated, quadrate or very shortrectangular, walls thickened and lumens usually oval; distal laminal cells 7–9 (–12) µm wide, 1: 1, papillae absent to low, simple, lumens subquadrate to oval, walls irregularly thickened, convex on both sides, 1-stratose. Specialized asexual reproduction by multicellular spheric gemmae in leaf-axils. Sexual condition sterile in range of flora. Sporophytes not seen. Distal laminal KOH reaction yellow or orangebrown.


Habitat: Soil, rock, spray zone
Elevation: low to high elevations

Distribution

V27 801-distribution-map.gif

Greenland, B.C., N.W.T., Mich., Mexico, Asia, Atlantic Islands (Cape Verde), Indian Ocean Islands (Reunion)

Discussion

The significant characters of Didymodon maschalogena are the small size of the leaves, which are catenulate, and the presence of propagula; the appearance of the areolation cannot distinguish this species from many congeners but is clearly in longitudinal rows. The species is apparently widespread but of spotty distribution. It was long known as D. michiganensis, but J.-P. Frahm et al. (1996) recently found an earlier name.

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 maschalogena"
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 +
not fragile +
Acuminate (?) +  and Acute (?) +
Richard H. Zander +
(Renauld & Cardot) Brotherus in H. G. A. Engler and K. Prantl +
weak +  and strong +
ovate +  and crescent--shaped +
papillose +  and smooth +
usually slightly wider +
ovate;differentiated +
differentiated +
Barbula maschalogena +
obovoid +
cucullate +
stegocarpous +
monoicous +, dioicous +  and sexual +
flat to bulging +
thin;thick +
1 (?) +  and 10 (?) +
hexagonal +
tomentose +  and bare +
excurrent +  and percurrent to very +
tapering +
quadrate +  and rectangular +
occasionally weakly dentate or crenulate +  and entire +
subquadrate;hexagonal or rounded-angular occasionally shortly rectangular or rhomboid +
Greenland +, B.C. +, N.W.T. +, Mich. +, Mexico +, Asia +, Atlantic Islands (Cape Verde) +  and Indian Ocean Islands (Reunion) +
low to high elevations +
differentiated +
multicellular +
occasional +
Soil, rock, spray zone +
yellow +  and orange-red or red +
grooved +  and monomorphic +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
spreading +  and catenulate-incurved +
ovatelanceolate;keeled +
ovate +, keeled +  and curled +
reduced +
specialized +
dioicous +  and sexual +
subquadrate +  and oval +
short-conic;long-conic +
photosynthetic +
widened +
lateral +  and terminal +
lateral +  and terminal +
twisted +, cleft +  and perforated +
red +, orange +  and yellow +
oblong +  and linear or long-triangular +
1 (?) +  and 2 (?) +
in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. +
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 +
orangebrown +  and yellow +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Barbula michiganensis +  and Didymodon michiganensis +
Didymodon maschalogena +
Didymodon +
species +
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 +
stemless +  and perigoniate +
green;glossy green +