Orthotrichum exiguum

Sullivant in A. Gray

in A. Gray, Manual ed. 2, 633. 1856.

Treatment appears in FNA Volume 28. Treatment on page 55. Mentioned on page 47, 60.

Plants 0.3–1 cm. Stem-leaves erect-appressed when dry, oblong-lanceolate to oblong, 0.7–1.3 mm; margins reflexed to broadly recurved, entire; apex rounded-obtuse; basal laminal cells elongate, walls thick, ± nodose; distal cells 7–13 µm, 1-stratose, papillae 1 or 2 per cell, conic or C-shaped, small. Specialized asexual reproduction by gemmae on leaves. Sexual condition gonioautoicous. Seta to 5 mm. Capsule immersed or slightly emergent, ovate-oblong, widest at mouth, less than 1 mm, distinctly 8-ribbed to base when dry; stomata superficial; peristome double; prostome absent; exostome teeth 16, spreading or reflexed when dry, papillose to cross-striolate proximally, papillose to vertically or reticulately striolate distally; endostome segments 8, well developed, usually present when capsule old and dry, thick, delicate, of 2 rows of cells, as wide as exostome teeth, hyaline, granulate-papillose. Calyptra short-conic, finely papillose, naked or hairs few near tip, hairs finely papillose. Spores 17–20 µm.


Habitat: Base and trunks of trees
Elevation: low to moderate elevations (10-200 m)

Distribution

V28 68-distribution-map.gif

Ga., N.C., S.C., Tenn., Va., e Asia

Discussion

Orthotrichum exiguum is distinguished by the distal laminal cells with bulging walls and C-shaped papillae; clavate stems; papillose, quadrate basal cells; differentiated perichaetial leaves; and capsules that are widest at the mouth, with 16 reflexed exostome teeth and delicate hyaline endostome.

Selected References

None.

Lower Taxa

None.

"widest" is not a number.

... more about "Orthotrichum exiguum"
awned +  and apiculate +
rounded-obtuse +
Dale H. Vitt +
Sullivant in A. Gray +
not decurrent +
erect +  and ascending +
short-conic +
8-ribbed or 16-ribbed +  and smooth +
ovate-oblong +
constricted +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
differentiated +
Ga. +, N.C. +, S.C. +, Tenn. +, Va. +  and e Asia +
low to moderate elevations (10-200 m) +
granulate-papillose +
linear-lanceolate +
reflexed +  and spreading +
papillose +  and vertically or reticulately striolate +
rectangular;elliptic +
connate +
occasional +
Base and trunks of trees +
papillose +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
oblong-lanceolate +  and oblong +
straight +
spreading +  and widespreading +
not rugose +
linear-lanceolate +, lanceolate +, oblong +  and ovate +
reflexed +  and broadly recurved +
denticulate +  and entire +
dioicous +, cladautoicous +  and sexual +
rostrate;convex;conic +
mammillose +  and smooth +
c--shaped +  and conic +
sometimes larger +
lateral +  and terminal +
in A. Gray, Manual ed. +
sinistrorse +, dextrorse +  and erect +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
papillose +  and smooth +
superficial +
Orthotrichum exiguum +
Orthotrichum +
species +
specialized +
cladautoicous +, pseudautoicous +, dioicous +  and sexual +
incrassate +
olive brown;reddish-brown;olive brown;reddish-brown;dark green +
large +  and small +