Orthotrichum ohioense

Plants 0.4–1.4 cm. Stem leaves stiff, loosely erect-appressed when dry, narrowly lanceolate to oblong-lanceolate, 1.4–2.9 mm; margins strongly revolute to just before apex, entire; apex obtuse to bluntly acute, not incurved when dry; basal laminal cells subquadrate to short-rectangular, walls thin, not nodose; distal cells 8–10 µm, 1-stratose, lumina irregular due to uneven wall thickenings, papillae 1–2 per cell, conic, low. Specialized asexual reproduction absent. Sexual condition gonioautoicous. Vaginula with hairs absent. Seta to 1 mm. Capsule emergent, oblong to ovate, 1–1.5 mm, 8-ribbed almost to base, ribs thin, delicate, not constricted below mouth; stomata immersed, mid capsule, 1/2 to completely covered by subsidiary cells, cells projecting vertically over stomata, inner walls thickened; peristome double; prostome absent; exostome teeth 8, splitting to 16 with age, reflexed, finely and densely papillose; endostome often absent, or segments 8, well developed, of 1 row of cells, smooth. Calyptra oblong, smooth, naked or slightly hairy, hairs smooth. Spores 15–19 µm.

Habitat: Deciduous trees in mesic hardwood forests, along streams
Elevation: low to moderate elevations (100-1000 m)

Distribution

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N.B., N.S., Ont., Que., Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Vt., Va., W.Va.

Discussion

Orthotrichum ohioense is distinguished by the 16 exostome teeth, eight rudimentary endostome segments, slightly 8-ribbed ovate capsules, leaves that are lanceolate and bluntly acute at the apices, and laminal cells smaller than 10 µm.

Selected References

None.

Lower Taxa

None.