Flora of North America species comparison

leaves stiff, erect-appressed when dry, narrowly lanceolate to ovate-lanceolate, 2–4.5 mm;

margins recurved to narrowly revolute to near apex, entire;

apex sharply to slenderly acute;

basal laminal cells elongate to rectangular, walls thick, ± nodose;

distal cells 6–13 µm, 1-stratose, papillae 1 or 2 per cell, conic and small, or 2-fid and low.

erect (creeping in O. kellmanii), branches erect to ascending.

usually erect-appressed and straight when dry, spreading to wide-spreading when moist, ovate, oblong, lanceolate, ligulate, or linear-lanceolate, not rugose;

margins entire or denticulate near apex;

apex acute, acuminate, apiculate, or obtuse, awn absent (present in O. diaphanum);

costa usually ending near apex;

basal laminal cells elongate-linear or rectangular;

distal cells usually rounded, almost isodiametric, 6–24 µm, papillose only over lumina, papillae 1–4 per cell, conic or 2-fid;

marginal cells gradually shorter than basal.

to 1.8 mm.

to 6 mm.

gonioautoicous.

gonioautoicous or cladautoicous, rarely dioicous;

perichaetial leaves similar to stem leaves or sometimes slightly differentiated.

immersed, emergent, or slightly exserted, usually 1/3 emergent, globose ovate, ovate-oblong, or short-oblong, 1.3–1.8 mm, slightly or distinctly 8-ribbed 1/2–2/3 length;

stomata superficial;

peristome single, rarely double;

prostome large, conspicuous, or rudimentary;

exostome teeth 16, erect or sometimes spreading-recurved when old, smooth, scattered-papillose, or coarsely papillose-granulate;

endostome segments absent, or rarely 8, rudimentary, of 1 row of cells, smooth or roughened.

immersed, emergent, or exserted, globose to cylindric, smooth or 8- or 16-ribbed, sometimes constricted below mouth when dry;

stomata superficial or immersed;

peristome double, rarely single or absent;

exostome teeth 0, 8, or 16, papillose or striate;

endostome segments 0, 8, or 16.

oblong, smooth, hairy or rarely naked, hairs finely papillose.

mitrate, conic-oblong to short-conic, not split at base, smooth or papillose, ± hairy or naked, plicate (not or obscurely plicate in O. gymnostomum and O. obtusifolium), covering entire capsule.

13–21 µm.

isosporous.

asexual reproduction absent.