genusOreas

Difference between revisions of "Oreas"

Bridel

Bryol. Univ. 1: 380. 1826 ,.

Etymology: Greek Oread, mythological nymph of hills and mountains, alluding to alpine habitat
Treatment appears in FNA Volume 27. Treatment on page 425. Mentioned on page 359, 381.
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Latest revision as of 21:27, 5 November 2020

Plants in dense cushions, yellow-green distally, brown and compacted with red-brown radicles proximally. Stems forked. Leaves erect-spreading, crisped when dry, lance-acuminate, keeled, ending in a sharp, hyaline cell or short point; margins 2-stratose and narrowly revolute nearly to the apex, entire or somewhat irregular; costa prominent at base, smooth, ending near the leaf apex, entire to shortly excurrent; distal cells irregularly rounded-quadrate, smooth, thick-walled; basal cells narrowly rectangular, thick-walled, the alar cells not differentiated. Sexual condition autoicous; perigonial buds minute, at base of perichaetium; perichaetial leaves similar to stem leaves, ending in a short, hyaline awn. Seta straight or somewhat curved when dry, cygneous when moist, yellow. Capsule mostly erect when dry, pendent when moist, short-necked, symmetric, subglobose but becoming broader at the mouth and somewhat contracted at the middle when dry, orange-brown, strongly ribbed; annulus persistent; operculum obliquely rostrate from a convex base; peristome teeth inserted slightly below the mouth, lance-acuminate, brown at base, entire or occasionally somewhat perforated, rarely cleft, yellowish brown above, pale at the slender tips, vertically striolate throughout. Calyptra cucullate, smooth. Spores warty-papillose, brown.

Distribution

North America, Europe, Asia.

Discussion

Species 1.

Oreas much resembles Cynodontium, but has a cygneous seta (when moist) and symmetric capsules. European specimens are more slender, with shorter leaves, but the differences are not significant.

Lower Taxa