Trematodon Moss

I. A. Worley and Z. Iwatsuki (1970) reported both Trematodon brevicollis and T. ambiguus from Alaska.

Leaves ovate-lanceolate to short-subulate from an ovate or obovate base, entire at apex; costa percurrent or subpercurrent. Seta short, 4-6 mm. Capsule not or little inclined, slightly curved; neck equaling the urn in length, cylindric or obovate, not strumose but tapering instead; peristome teeth entire or perforate near apex, not fragile, commonly persistent; annulus compound, revoluble.

Trematodon brevicollis Hornsch. Flora 2 : 88. 1819
Trematodon amWgMMS ire!'!foWis Schwaegr. Suppl. 2': 69. 1823.
Plants gregarious in small tufts; stems short, 2-4 mm. high: leaves erect, appressed carinate, ovate-lanceolate, 1-2 mm. long; costa broad, ending in the short acuminate apex; margins entire, the cells lax, hexagonal or rectangular, with thick walls; perichaetial leaves longer, the apex abruptly mucronate or subulate. Autoicous: antheridia terminal on basal buds: seta stout, 4— 6 mm. high, erect, pale-yellow : calyptra cucullate, lobed : capsule 3— 4 mm. long, erect or bent at the neck which equals the urn, 1 mm. long; stomata imperfect; lid 1 mm. long, rostrate; peristome .short, deeply inserted, dark-red; teeth striate, of 10-12 joints, entire or slightly perforate at the apex; mouth bordered by 4-5 rows of large, lax, dark-brown cells; cells of the walls irregularly thickened; annulus of 2 rows, falling in fragments with the lid : spores brown, rough, 45-60 m in diameter, maturing in August and September.
Type locality: Near Kals in Tyrol, Austria.
Distribution: Greenland; also in alpine reitions of Europe and central Asia.