Ptychostomum cryophilum

Plants in dense swelling turfs, red, red-green, or red-yellow. Stems 2–4 (–6) cm, fertile stems comose, innovations evenly foliate. Leaves yellow-green to pink or red, dark redbrown with age, somewhat distant, older leaves ± imbricate, younger leaves strongly contorted to shrunken when dry, ovate, strongly concave, 0.5–3 mm, not much enlarged toward stem apex; base green, weakly decurrent; margins plane or weakly revolute in proximal 1/4, limbidium strong, in 2 or 3 rows; apex obtuse; costa percurrent or sometimes not reaching apex, apiculus absent; proximal laminal cells rectangular, 3–4: 1; medial and distal cells irregular, 15–22 (–25) µm wide, 2–3: 1, walls thin. Specialized asexual reproduction absent. Sexual condition dioicous. Seta red, 2–4 cm, slender, straight to somewhat flexuose. Capsule yellowbrown to brown, ovate to obovate, symmetric, 2–4 mm, mouth yellowbrown; operculum conic, weakly apiculate; peristome well developed; exostome teeth yellowbrown, lamellae straight, pores absent near base along mid line; endostome not adherent to exostome, basal membrane 1/2–2/3 exostome height, segments with ovate perforations, cilia long, appendiculate. Spores 16–20 µm, pale-yellow.

Phenology: Capsules mature Jul–Aug.
Habitat: Wet soil, rock in streams, wetlands, late melting snow beds
Elevation: low to high elevations (0-2000 m)

Greenland, Alta., B.C., N.W.T., Nunavut, Yukon, Alaska, Eurasia (arctic regions), Eurasia (India), Eurasia (Mongolia), Eurasia (Nepal)

Discussion

Ptychostomum cryophilum is distinguished by the densely compact red turfs, ovate concave leaves, and weak costae. The costae are red; the proximal laminal cells are narrower than the more distal cells.

Selected References

None.

Lower Taxa