Orthotrichum Moss

Orthotrichum gymnostomum Bruch; Brid. Bryol
Univ. 1:782. 1872.
Plants in yellowish-green tufts, reddish-brown within; stems 0.5-1 cm. tall, erect, rigid, usually simple, sometimes with one or more clavate innovations; leaves when dry closely imbricate, when moist spreading, oblong-ovate, concave, carinate, broadly obtuse, 2-2.5 mm. long, the margins strongly involute except at the base, the apex often almost cymbiform; costa narrow, disappearing below the apex; middle basal leaf-cells broadly linear, quadrate at the basal angles, the upper oblong-rhomboidal, the apical oval or roundish, about 15 y. in diameter, each with one or two stout papillae; perichaetial leaves similar but longer, oblong-lanceolate, often plane at the apex; dioicous; male plants smaller, sometimes in separate tufts; seta very short; capsules immersed, oblong-ovate, oblong when dry and empty, rounded at the truncate base, the neck shorter than the spore-sac, the 8 ribs yellowish, each composed of 2-4 rows of thick-walled cells; calyptra plicate, conical, without hairs but rough and black at the apex; only a few superficial stomata near the mouth of the capsule ; operculum narrowly conical from a convex base; spores maturing in spring.
Type locality: Europe.
Distribution: On aspens; Upper Sandy Point, Newfoundland (Waghorne) ; Europe; Japan.

Szurpek bezzębny (Orthotrichum gymnostomum Bruch ex Brid.) – gatunek mchu należący do rodziny szurpkowatych (Orthotrichaceae). Rośnie na korze drzew liściastych.

Orthotrichum gymnostomum là một loài Rêu trong họ Orthotrichaceae. Loài này được Bruch ex Brid. mô tả khoa học đầu tiên năm 1827.