Pseudocrossidium replicatum (Taylor) R.H.Zander
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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.
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Family
Pottiaceae
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Scientific Name
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Description
Species Description - Plants yellow-green above, red below. Stems 3-15 mm long, often branched, red-brown, sparsely radiculose. Leaves when dry, spirally appressed, when moist spreading up to 45°, 1—1.8(—2.6) mm long, elliptic to ovate-lanceolate, broadly acute to rounded, with the base ovate to oblong; margins spirally revolute, with papillae small or none at the exposed surface, differentiated internally as thin-walled, hollow, papillose, very green cells; costa not tapered or wider above the midleaf, shortly excurrent as a sharp, smooth mucro of 1-3 cells, occasionally cuspidate, ventrally covered above the midleaf to near the apex by short, papillose cells, the ventral stereids few or none; upper cells subquadrate to hexagonal, 8-9 µm wide, occasionally transversely elongate at the margins, bulging at both surfaces, thin-walled or occasionally thickened on the ventral surface, with papillae crowded, low, compound, with several salients per cell; basal cells short-rectangular across the leaf or more commonly in median groups, u p to 11 µm wide, with walls evenly thickened to thin-walled, often orange toward the costa. Perichaetial leaves scarcely differentiated. Setae 10-14 mm long; capsules 1.6-2.5(-3.5) mm long, ellipsoidal to cylindric; operculum short- to long-conic; peristome divisions filamentous, (700-)900-1000 µm long, orange to yellow, densely spiculose, loosely once-twisted. Spores 9-10 µm, weakly papillose.
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Discussion
Fig. 220a-e
P. replicatum (Tayl.) Zand., Phytologia 44: 206. 1979.
Barbula replicata Tayl., London J. Bot. 5: 49. 1846.
B. spiralis Schimp. ex C. Mull., Syn. Muse. Frond. 1: 622. 1849.
Tortula spiralis (Schimp. ex C. Mull.) Mitt., J. Linn. Soc, Bot. 12: 151.1869.
Barbula spiralis var. emarginata Card., Rev. Bryol. 36: 84. 1909.
Plants of Mexico are generally somewhat smaller than those of South America. Pseudocrossidium revolutum (Brid. ex Schrad.) Zand, is known from southern California; it has only once-revolute leaf margins, propagula on the upper surface of the costa, and greatly differentiated perichaetial leaves.
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Distribution
On soil or rock (including lava, concrete, and adobe), at 750-2590 m elev.; Chiapas, Chihuahua, Coahuila, Distrito Federal, Durango, Hidalgo, Jalisco, Mexico, Michoacan, Morelos, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Sonora, Tamaulipas, Tlaxcala, Veracruz, Zacatecas.—Mexico; southwestern United States; northern Andes of South America.
Mexico North America| United States of America North America| Venezuela South America| Colombia South America| Ecuador South America| Peru South America|