Brachythecium stereopoma (Mitt.) A.Jaeger
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Authority
Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)
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Family
Brachytheciaceae
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Scientific Name
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Description
Species Description - Plants medium-sized or occasionally small and slender or robust, in loose or dense, yellow-green to dark-green spreading mats, occasionally in delicate, thin mats or erect tufts. Stems prostrate to decumbent, densely or rarely loosely terete-foliate, irregularly to pinnately branched; branches terete, ± tapered at the tips, equally long throughout or shorter and more distant toward the stem tips. Leaves erect-imbricate to erect when dry, more open when moist, occasionally slightly homomallous. Stem leaves 1.1-2.3 x 0.5-1.1 mm, concave, cordate-ovate, ovate-lanceolate, triangular-acuminate, or lanceolate, gradually ± long-acuminate, with tips straight or curved and ± twisted, slightly or only occasionally plicate, short- to long-decurrent; margins reflexed at base, plane and sermlate to serrate in the upper portion, entire below; costa broad at base, tapered to near the leaf middle and often ending in an inconspicuous spine; median and apical cells fusiform to linear, 45.6-102.6 x 5.7-9.1 µm; basal cells regularly or irregularly rectangular, slightly lax, with walls not or slightly porose in larger leaves, 22.8-57 x 8-17.1 µm; alar cells small to shghtiy lax, quadrate to rectangular in ± short columns extending into decurrencies, 11.4-39.9 x 9.1-28.5 µm. Branch leaves smaller and narrower, 0.6-1.5 x 0.2-0.6 mm, ovate-lanceolate, acuminate, ± twisted at the tips; margins more sharply serrate. Dioicous. Perichaetial bracts sheathing at base, tapered to a long, flexuose acumen. Setae up to 27 mm long, red-brown, smooth; capsules light brown, erect to inclined, cylindric and curved, 1-2.3 x 0.4-0.8 mm; annulus none; operculum conic-apiculate to elongateconic and ± curved, 0.7-1.1 mm long; ciha of endostome 2-3, papillose, nodose. Spores 9.9-18.7 µm, finely papillose.
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Discussion
Fig. 692
B. stereopoma (Spruce ex Mitt.) Jaeg., Ber. Thatigk. St. Gallischen Naturwiss. Ges. 1876-77: 327. 1878.
Hypnum stereopoma Spruce ex Mitt.J. Linn. Soc, Bot. 12: 561. 1869.
Brachythecium trochahbasis C. Miill., Bull. Herb. Boissier 5: 218. 1897, fide Bartram, 1949c.
B. pusillo-albicans C. Miill., Bull. Herb. Boissier 5: 218. l&91,fide Bartram, 1949c.
B. tenuinerve Card., Rev. Bryol. 37: 65.1910.
B. sericeolum Card., Rev. Bryol. 37: 66. 1910.
B. lanceolifoliumCard., Rev. Bryol. 37:66.1910.
B. lanceolifolium var. gracile Card., Rev. Bryol. 37: 66. 1910.
B. albulumBesch. ex Card., Rev. Bryol. 37: 66. 1910.
B.flexinerve Card., Rev. Bryol. 37: 67. 1910.
B. alboflavens Card., Rev. Bryol. 37: 68. 1910.
B. alboviride Besch. ex Card., Rev. Bryol. 37: 69. 1910.
B. hastifolium Card., Rev. Bryol. 37: 69. 1910.
B. hylocomioides Card., Rev. Bryol. 37: 69. 1910.
Chamberlainia stereopoma (Spruce ex Mitt.) Robins., Bryologist 65: 105.1962.
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Distribution
On bases of trees, stumps, and logs, occasionally also limestone rocks (rarely on granitic rocks), stone walls, soil of road and trail banks, and humus in moist, oak-pine and Cupressusforests, 600-3600 m alt.; Chiapas, Chihuahua, Distrito Federal, Durango, Guerrero, Hidalgo, Jalisco, Mexico, Michoacan, Morelos, Nayarit, Nuevo León, Oaxaca, Puebla, Queretaro, San Luis Potosi, Sinaloa, Tamaulipas, Tlaxcala, Veracruz.—Mexico; Central America; South America along the Andes to northern Argentina a
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