Rhodobryum ontariense (Kindb.) Kindb., Eur. N. Amer. Bryin. 2: 346. 1897.

Bryum ontariense Kindb., Ottawa Naturalist 2: 155. 1889. Protologue: Ontario. “quite common throughout Ontario”. Lectotype (Iwatsuki & Koponen 1972)  Macoun (?) Canadian Musci 184 (MO). 

Plants robust, dark-green to light-green, in dense tufts to 2–5 cm high; rhizoids reddish brown, papillose, moderately developed on stems. Leaves 9–13 x 4–5 mm, distinctly rosulate, erect, stiff, variously twisted and contorted with non-undulate margins when dry, spreading when wet, obovate‑oblong, not or weakly decurrent; apices cuspidate; margins indistinctly bordered by 1-2 rows of somewhat longer and narrower cells, recurved in lower _, plane above, sharply serrate in upper half, the teeth single; costa shortly excurrent, in cross-section at base with large cluster of dorsal stereids; upper cells rhomboidal to rhomboidal-hexagonal, thin‑walled, 50–110 x 20–30 μm, basal cells long‑rectangular, 140–230 x 40–50 μm, alar cells shorter and broader, otherwise weakly differentiated. Dioicous. Setae 1–5 per perichaetium, 40–55 mm long, dark-red. Capsules 5–7 mm long, cylindrical to oblong-pyriform, weakly striate when dry, inclined to pendent, neck short; opercula 1–1.3 mm long, conic; peristome perfect, exostome teeth red-yellow, densely and finely papillose below, papillose above, strongly trabeculate at back, endostome yellowish hyaline, lightly papillose, basal membrane ½–_ of exostome teeth length, segments well-developed, broadly perforate, cilia 2–3, appendiculate. Spores 16–22 μm, lightly papillose.