Didymodon murrayae

Otnyukova

Arctoa 11: 345, fig. 6. 2002 (as murrayeae),.

Treatment appears in FNA Volume 27. Treatment on page 556. Mentioned on page 540.

Plants green to redbrown. Stems to 1 cm, central strand present. Stem-leaves weakly appressed when dry, weakly spreading and not keeled when moist, monomorphic, oblong-lanceolate, grooved adaxially along the costa near leaf apex, 0.6–0.9 mm, base oblong in shape, margins broadly recurved in proximal 3/4 of leaf to near apex, entire but often notched laterally, apex subulate to irregularly dentate-clavate, caducous (deciduous early), commonly ending in a conical cell; costa percurrent to excurrent, not strongly spurred, not much widened or tapering, without a pad of cells, adaxial costal cells rectangular, ca. 4 cells wide at mid leaf, guide cells in 1 layer; basal laminal cells weakly differentiated medially, walls thin to evenly thickened, shortrectangular, not perforated; distal laminal cells 8–10 µm wide, 1: 1, smooth or weakly conic-mammillose at apex, lumens quadrate, walls thin, weakly convex on both sides of lamina, distal leaf margins 2-stratose in deciduous part of apex. Specialized asexual reproduction by thickened, caducous leaf apices, often toothed. Sexual condition unknown. Sporophytes unknown. Distal laminal KOH reaction red.


Habitat: Willow limbs and dead tree bark
Elevation: low to moderate elevations

Discussion

Didymodon murrayae was originally reported (R. H. Zander 1978f) as D. sinuosus (Mitten) Delogne, a European taxon that differs in its rupestral habitat, much larger leaves, quadrate adaxial costal cells and merely fragile leaf apex. Trichostomum tenuirostre may occasionally have similar sequentially constricted, fragile leaves, but the leaf cells are papillose and the plane margins are crenulate by projecting walls. Didymodon murrayae is similar to two other Asian species, D. gaochenii and D. hedysariformis (T. N. Otnyukova 2002), but the former differs in the rounded apex of the propagulum (no teeth), and the latter in its propagulum contorted in appearance before dispersal.

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 murrayae"
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 +
Otnyukova +
weak +  and strong +
ovate +  and crescent--shaped +
papillose +  and smooth +
usually slightly wider +
differentiated +
Pottiaceae tribe Barbuleae +
obovoid +
cucullate +
stegocarpous +
monoicous +, dioicous +  and sexual +
flat to bulging +
thin;thick +
1 (?) +  and 10 (?) +
conical +
tomentose +  and bare +
percurrent +  and excurrent +
tapering +
widened +
quadrate +  and rectangular +
conic-mammillose +  and smooth +
occasionally weakly dentate or crenulate +  and entire +
subquadrate;hexagonal or rounded-angular occasionally shortly rectangular or rhomboid +
B.C. +, Alaska +  and Asia +
low to moderate elevations +
differentiated +
multicellular +
occasional +
Willow limbs and dead tree bark +
yellow +  and orange-red or red +
grooved +  and monomorphic +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
oblong-lanceolate;keeled +
ovate +, keeled +  and curled +
reduced +
specialized +
dioicous +  and sexual +
quadrate +
short-conic;long-conic +
photosynthetic +
solid +  and simple +
deciduous +
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 /> (1 cm10 mm <br />0.01 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 murrayae +
Didymodon +
species +
elliptic;cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
rudimentary +
not perforated +
red +  and yellow +
thin +  and evenly thickened +
stemless +  and perigoniate +