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FNA | Family List | FNA Vol. 28 | Orthotrichaceae | Orthotrichum

12. Orthotrichum exiguum Sullivant in A. Gray, Manual ed. 2. 633. 1856.

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, , of 2 rows of cells, , granulate-papillose. Calyptra short-conic, finely papillose, naked or hairs few near tip, hairs finely papillose. Spores 17-20 µm.

Base and trunks of trees; low to moderate elevations (10-200 m); Ga., N.C., S.C., Tenn., Va.; e Asia.

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.


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