Hymenostylium recurvirostrum (Hedw.) Dixon

Authority

Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1): 1-452.

Family

Pottiaceae

Scientific Name

Hymenostylium recurvirostrum (Hedw.) Dixon

Description

Species Description - Stems 1-4(-8) cm high, occasionally red-tomentose, sometimes papillose. Leaves usually distant, when dry erectto 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), platelike 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 hyahne 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 obliquemouthed; 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) p m , lightly papillose to lowspiculose.

Discussion

Fig. 187

H. recurvirostrum (Hedw.) Dix., Rev. Bryol. Lichenol. 6: 96. 1934.

Gymnostomum recurvirostrumHedw., Sp. Muse. 33. 1801.

G. orizabanumSchimp. ex Besch., Mem. Soc. Sci. Nat. Cherbourg 16: 159.1872.

G. mpestre Schleich. ex Schwaegr. var. latifolium Zett., Kongl. Svenska Vetenskapsakad. Handl. 13(13): 11.1876.

Barbula curvirostris Lindb. fo. seabra Lindb., Musci Scand. 22, 1879.

Gymnostomum uvidum Card., Rev. Bryol. 36: 70. 1909.

Leptodontium angustinerve Ther., Smithsonian Misc. Collect. 85(4): 10. 1931.

Gymnostomum recurvirostmmvar. scabrum (Lindb.) Grout, Moss Fl. N.Amer. 1(3): 160. 1938.

G. recurvirostrum Hedw. var. latifolium (Zett.) Flow., Bryologist 72: 243. 1969.

No one character, even the systylious nature of the capsule, is constant. A m o n g 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.

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 Potosi, Sonora, Tamaulipas, Veracruz.—Mexico to South America; West Indies; widespread in North America; Europe, Asia, Africa, and Australasia.

Mexico North America| Central America| South America| West Indies| North America| Europe| Asia| Africa| Australia Oceania|