Macrocoma tenuis subsp. sullivantii

(Müller Hal.) Vitt

Bryologist 83: 413. 1981.

Illustrated
Basionym: Macromitrium sullivantii Bot. Zeitung (Berlin) 20: 361. 1862
Treatment appears in FNA Volume 28. Treatment on page 43.

Branch leaves carinate, 0.7–1.2 mm; margins ± plane; costa prominent; laminal cells to 22 µm; distal cells bulging. Spores 33–42 µm.


Habitat: Dry mountain tops and slopes of southern Blue Ridge escarpment, trunks of Juniperus, Pinus, and Quercus
Elevation: moderate elevations

Distribution

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Ga., N.C., S.C., Tenn., Mexico, West Indies, Central America, South America, Asia (China), Asia (Japan), Asia (Korea), Asia (Taiwan)

Discussion

Subspecies sullivantii differs from other taxa in Orthotrichaceae by its slender, creeping stems with erect branches. The leaves are erect-appressed, and the basal laminal cells are rounded-quadrate. Subspecies sullivantii is closely related to a Mexican species, Macrocoma orthotrichoides (Raddi) Wijk & Margadant, which differs in having a peristome and sparsely hairy calyptra.

Selected References

None.

Lower Taxa

None.
awned +  and apiculate +
acute;narrowly obtuse +
Dale H. Vitt +
- Müller Hal. Vitt +
not decurrent +
Macromitrium sullivantii +
0.07 cm0.7 mm <br />7.0e-4 m <br /> - 0.12 cm1.2 mm <br />0.0012 m <br /> +
elliptic-conic +  and mitrate +
16-ribbed +, 8-ribbed +  and symmetric +
oblong-cylindric;fusiform +
not constricted +
0.13 cm1.3 mm <br />0.0013 m <br /> - 0.2 cm2 mm <br />0.002 m <br /> +
differentiated +
roundedquadrate +
Ga. +, N.C. +, S.C. +, Tenn. +, Mexico +, West Indies +, Central America +, South America +, Asia - China +, Asia - Japan +, Asia - Korea +  and Asia - Taiwan +
moderate elevations +
linear-lanceolate +
reflexed +, recurved +  and erect +
rectangular;elliptic +
connate +
occasional +
Dry mountain tops and slopes of southern Blue Ridge escarpment, trunks of Juniperus, Pinus, and Quercus +
flexuose +
erect-spreading +
papillose-mammillose +
not rugose +
lanceolate +  and ovatelanceolate +
rostrate;convex;conic +
mammillose +  and smooth +
2-fid +  and conic +
sometimes larger +
lateral +  and terminal +
0.4 cm4 mm <br />0.004 m <br /> - 0.65 cm6.5 mm <br />0.0065 m <br /> +
Illustrated +
erect-ascending +
superficial +
Macrocoma tenuis subsp. sullivantii +
Macrocoma tenuis +
subspecies +
specialized +
cladautoicous +, pseudautoicous +, dioicous +  and sexual +
incrassate +
olive brown;reddish-brown;olive brown;reddish-brown;dark green +