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Oxystegus tenuirostris (Hook. & Taylor) A.J.E. Sm. Search in The Plant ListSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenSearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Published In: Journal of Bryology 9: 393. 1977. (J. Bryol.) Name publication detail

Project Name Data (Last Modified On 10/22/2013)
Acceptance : Accepted
Project data     (Last Modified On 10/22/2013)
Nomenclature: O. tenuirostris (Hook. & Tayl.) A. Smith, J. Bryol. 9: 393. 1977.
Weissia tenuirostris Hook. & Tayl., Musc. Brit. ed. 2, 83. 1827.
W. cylindrica Bruch ex Brid., Bryol. Univ. 1: 806. 1827.
Trichostomum cylindricum (Bruch ex Brid.) C. Muell., Syn. Musc. Frond.1: 586. 1849.
T. clintonii C. Muell., Linnaea 38: 636. 1874.
Oxystegus cylindricus (Brid.) Hilp., Bot. Centralbl. 50(2): 620. 1933.
Distribution: On rocks, also on banks and bases of trees at 1200-3000 m elev.; Chiapas, Chihuahua, Coahuila, Distrito Federal, Durango, Guerrero, Jalisco, Mexico, Michoacan, Morelos, Nayarit, Oaxaca, Puebla, San Luis Potos’, Tamaulipas, Veracruz. - Mexico; Central and South America; widespread in North America; Greenland; Europe and Asia.
Discussion: When the basal cells extend somewhat up the margins, the plants may be confused with Tortella tortuosa, but the deep orange color in 2% KOH is distinctive (as opposed to pale yellow or negative in T. tortuosa). A Mexican record of Didymodon juniperinus (C. Muell.) Broth. (Bowers, Sharp & Robinson, 1973) can be referred to Oxystegus tenuirostris. The var. holtii (Braithw.) A. Smith, not yet found in Mexico, has very broad leaves and upper margins often distinctly dentate and essentially smooth-celled. Three expressions of the O. tenuirostris complex can be recognized in Mexico:
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Plants yellow-green above, brown below, irregularly branched, weakly radiculose, up to 3 cm high. Leaves incurved-contorted and occasionally catenulate when dry, spreading up to 45¡ when moist, usually very fragile, weakly concave, commonly 3-5 mm long, long-lanceolate; costa with ventral epidermal cells quadrate and papillose except toward the apex where they are elongate and smooth; upper cells 10-12(-14) µm, usually evenly thick-walled, with papillae 2-4 and bifid or sometimes fused to form a single compound papilla covering the lumen; basal cells with thin or thick walls, 10-15 µm wide and 3-5:1, generally short-rectangular and thick-walled near the top of the sheathing base. Dioicous. Setae 1-1.5 cm long; capsules 3-3.2 mm long, long-cylindric; annulus of 1-2 rows of vesiculose cells; operculum long-conic to rostrate; peristome teeth long-ligulate, up to 220 µm long, yellow to brown, weakly papillose to striolate. Spores 13-20 µm, papillose.



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