Rhynchostegium serrulatum (Hedw.) 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 of medium to fairly robust stature, in flat, loose, slightly glossy, green or yellow-green mats. Stems prostrate, irregularly pinnate-branched; branches tapered, ± flattened. Leaves spreading to wide-spreading when dry, more spreading when moist, ± complanate. Stem leaves slightly concave, neither plicate nor decurrent, 1-2.3 x 0.6-1.1 mm, ovate-lanceolate to oblong-ovate, slenderly acuminate, often twisted at the tip; margins serrate to near the base; costa gradually tapered, ending at or above the midleaf, sometimes as a dorsal spine; median cells linear-flexuose, 45-185 x 5-9 µm, slightly shorter in the acumen; basal cells ± lax, linear to rectangular, 20-50 x 5-17 µm; alar cells rectangular, 15-38 x 6-17 µm, occasionally bordered by long, slender cells (16-65 x 4-10 µm). Branch leaves 1-2.2 x 0.3-0.8 mm, ovate-lanceolate, acuminate. Autoicous. Perichaetial leaves up to 2.4 mm long, tapered to a long, slender acumen from a sheathing base. Setae red, smooth, 10-24 mm long; capsules 0.8-2.2 x 0.5-1 mm, slightly curved, oblong-cylindric, constricted below the mouth when dry; annulus of 2 layers of inflated cells; operculum conic-rostrate, up to 1.3 mm long; cilia of endostome 2-3, nodose. Spores 7-17 µm, nearly smooth.
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Discussion
Fig. 699
R. serrulatum (Hedw.) Jaeg., Ber. Thatigk. St. Gallischen Naturwiss. Ges. 1876-77: 370. 1878.
Hypnum ser rulatumHedvi., Sp. Muse. 238. 1801.
H. huitomalconumC. Müll., Syn. Muse Frond. 2: 248. 1851.
Rhynchostegium callistomum Besch., Mem. Soc. Sci. Nat. Cherbourg 16: 250. 1872.
R. blandum Hamper Besch., Mem. Soc. Sci. Nat. Cherbourg 16: 250. 1872.
R. huitomalconum(C. Mull.) Besch., Mem. Soc Sci. Nat. Cherbourg 16: 250. 1872.
Hypnum expallescens C. Müll., Linnaea 38: 659. 1874, horn, illeg.
Rhynchostegium expallescens (C. Mull.) Jaeg., Ber. Thatigk. St.
Gallischen Naturwiss. Ges. 1876-77: 373. 1878.
R. frondicoh C. Mull., Hedwigia 37: 261. 1898.
Steerecleus serruhtus (Hedw.) Robins., Mem. N e w York Bot Gard. 45:681.1987.
Theriot's report (1931) of Brachythecium acutum (Mitt.) Sull. from Puebla (Arsene 5001) belongs to Rhynchostegium serrulatum instead.
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Distribution
On soil, humus, or bark of trees and shrubs in moist, wooded areas at 1500-3000 m alt.; Chiapas, Hidalgo, Mexico, Michoacan, Nuevo León, Puebla, San Luis Potosi, Tamaulipas, Veracruz.—Mexico; Central and South America; eastern North America.
North America| South America| Central America|