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

14. Orthotrichum flowersii Vitt, Bryologist. 74: 159, figs. 1-8. 1971.

Plants to 0.5 cm. Stem leaves stiff, erect-appressed when dry, ovate-oblong to oblong-ligulate, 2-2.8 mm; margins revolute, entire or rough near apex by means of projecting papillae; apex rounded-obtuse, often mucronate, ; basal laminal cells rectangular to short- rectangular, walls thin, not nodose; distal cells 13-19µm, 1-stratose, papillae 2 per cell, conic, small. Specialized asexual reproduction by gemmae on leaves. Sexual condition autoicous. Seta 0.5 mm. Capsule immersed or short-emergent, ovate-oblong to oblong when mature, 1-1.4 mm, strongly 8-ribbed 1/2 -3/4 capsule length when dry, constricted below mouth when dry; stomata immersed, ; peristome double; prostome absent; exostome teeth 8, reflexed, densely papillose or papillose-striate distally; endostome segments 8, not well developed, usually of 1 row of cells, finely roughened. Calyptra oblong, smooth, naked or hairs few, smooth. Spores 10-17 µm.

Base of trees, trunks of deciduous trees, xeric and exposed habitats; moderate to high elevations (500- 2000 m); Calif., Idaho, Nev., Utah; Europe.

Orthotrichum flowersii is distinguished from O. pallens and O. pumilum by its blunt, carinate leaves that are ovate or ovate-oblong, almost always with a small mucro. The leaf apices are subcucullate; the stomata are found in one or two rows mid capsule.


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