Grimmia arizonae Renauld & Cardot
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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
Grimmiaceae
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Scientific Name
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Description
Species Description - Stems up to 30 mm high. Leaves imbricate to wide-spreading, keeled, ovate-lanceolate, 1-3 mm long, exclusive of spinulose hair points 0.4-0.8 mm long on upper leaves (the lower leaves with shorter points or none); margins usually bistratose in the upper half or more, sometimes unistratose or 2-3-stratose at the apex, but rarely thicker than the lamina, recurved on 1 or both sides toward the base; costa strong, usually with more than 2 guide cells; cells bistratose in the upper half, 5-8 µm, irregularly rounded, thick-walled, not sinuose above but becoming so below the leaf middle; basal cells adjacent to the costa long, narrow, and usually ± sinuose, the alar cells short, usually sinuose-walled. Dioicous. Perichaetial leaves larger than vegetative leaves, with hair points up to 1.3 mm long. Setae straight, 0.5-1 mm long (usually less than 1 mm); capsules immersed, up to 1.6 mm long, erect, smooth; annulus deciduous, of about 2 rows of cells; operculum up to 0.8 mm long; peristome teeth red-brown, cribrose or irregularly 2-3 divided above the middle. Spores 9-13 µm, smooth or nearly so. Calyptrae mitrate.
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Discussion
Fig. 299
G arizonae Ren. & Card., Rev. Bryol. 19: 85. 1892.
G. arsenei Card., Rev. Bryol. 40: 37. 1913.
G. santa-ritae Bartr., Bryologist 27: 60. 1924.
This is the only Mexican Grimmia with leaves keeled and bistratose above the middle and no thicker at the margins (which are recurved below) and hair points spinulose. The differentiated alar cells are usually sinuose-walled.
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Distribution
At 1500 to 3000 m alt.; Baja California, Chihuahua, Coahuila, Durango, Jalisco, Michoacan, Oaxaca, San Luis Potosi, Sonora, Veracruz.—Mexico; southwestern United States.
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