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Published In: Revue Bryologique et Lichénologique 6: 96. 1933[1934]. (Rev. Bryol. Lichénol.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 10/22/2013)
Acceptance : Accepted
Project data     (Last Modified On 10/22/2013)
Nomenclature: H. recurvirostrum (Hedw.) Dix., Rev. Bryol. Lichenol. 6: 96. 1934.
Gymnostomum recurvirostrum Hedw., Sp. Musc. 33. 1801.
G. orizabanum Schimp. ex Besch., Mem. Soc. Sci. Nat. Cherbourg 16: 159. 1872.
G. rupestre Schleich. ex Schwaegr. var. latifolium Zett., Kongl. Svenska Vetenskapsakad. Handl. 13(13): 11. 1876.
Barbula curvirostris Lindb. fo. scabra Lindb., Musci Scand. 22, 1879.
Gymnostomum uvidum Card., Rev. Bryol. 36: 70. 1909.
Leptodontium angustinerve Ther., Smithson. Misc. Coll. 85(4): 10. 1931.
Gymnostomum recurvirostrum var. scabrum (Lindb.) Grout, Moss Fl. N. Amer. 1(3): 160. 1938.
G. recurvirostrum Hedw. var. latifolium (Zett.) Flow., Bryologist 72: 243. 1969.
Distribution: On rock (shale, limestone, dolomite, concrete, and serpentine) in seepage near streams, sometimes near waterfalls, at 500-3700 m elev.; Chiapas, Coahuila, Distrito Federal, Guerrero, Hidalgo, Morelos, Oaxaca, Puebla, San Luis Potos’, Sonora, Tamaulipas, Veracruz. -- Mexico to South America; West Indies; widespread in North America; Europe, Asia, Africa, and Australasia.
Discussion: No one character, even the systylious nature of the capsule, is constant. Among the more diagnostic features are the cells of the upper lamina, larger inward from the margin and short-rectangular, often thickened at the corners and having simple papillae. (The variation is discussed in detail by Zander, 1977.) Amphidium mougeotii (B.S.G.) Schimp. (not known from Mexico) is similar in gametophytic appearance and costal structure but has numerous tiny, crowded papillae over the lumina. Tuerckheimia angustifolia has a blue-green color and massive, often multifid papillae, 1-2(-3) per cell.
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Stems 1-4(-8) cm high, occasionally red-tomentose, sometimes papillose. Leaves usually distant, when dry erect- to spreading-incurved, sometimes ± twisted or secund, when moist spreading to squarrose or recurved, the base scarcely differentiated to oval, not sheathing, not or narrowly decurrent; margins entire or rarely serrulate above or below owing to projecting cell walls, rarely distantly denticulate and rarely bistratose above; costa ending 1-2 cells below the apex to short-excurrent as a broad apiculus, sometimes ending in a single pellucid cell and usually serrulate because of projecting cell walls, with 1 or 2 stereid bands; upper cells with 3-5 bifid papillae (or rarely 1 per cell and multifid), plate-like or granulose; basal cells usually differentiated next to the costa, the marginal cells occasionally differentiated in 1-3 rows of narrowly rectangular, thin-walled cells extending into a decurrency, the median basal cells hyaline to yellowish, smooth or weakly papillose above, 9-15 µm wide and 2-4:1, with walls thin or evenly thickened, sometimes irregularly thickened and pitted. Setae (3-)4-8(-10) mm long; capsules 0.7-1.2(-1.5) mm long, occasionally inclined and oblique-mouthed; annulus consisting of weakly vesiculose, yellow-brown, occasionally hexagonal cells; operculum (0.4-)0.5-0.8(-1.7) mm long, its cells in straight or ± spiral rows. Spores (9-)10-13(-15) µm, lightly papillose to low-spiculose.


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