Homalothecium arenarium (Lesq.) E.Lawton
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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 size, in loose, yellow-green to brownish mats. Stems creeping, short or elongate, straight or ± curved, irregularly branched; branches ascending, short, julaceous, ± attenuate. Stem leaves imbricate to erect when dry, erect or spreading w h e n moist, 0.9-1.6 x 0.3-0.5 mm, ovate-lanceolate and acuminate to elongate-triangular; margins reflexed at base, entire throughout or sermlate above; costa about 7/8 or more the leaf length, ending in a spine or with several spines in the upper third, occasionally with a cluster of rhizoids at the base; upper median cells 40-100 x 4—6 µm; inner basal and alar cells quadrate to rounded, thick-walled, 4 - 1 5 x 5 - 12 µm, extending 4—6 cells up the costa and the margins and extending upward 8-12 cells along the plicae. Branch leaves strongly plicate, 0.5-1.2 x 0.1-0.3 mm, ovate-lanceolate, acuminate, becoming narrowly acute to obtuse toward the branch tips; costa serrate in the upper third and ending in a spine; cells near the leaf apex often papillose because of projecting end walls. Setae red, 10-20 mm long, papillose below; capsules 1-1.8 x 0.5-0.7 mm, cylindric; operculum up to 0.7 mm long; cilia of endostome 1-2. Spores 10-15 µm.
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Discussion
Fig. 681
H. arenarium (Lesq.) Lawt., Bull. Torrey Bot. Club 92: 346. 1965.
Hypnum arenarium Lesq., Trans. Amer. Phil. Soc. 13(1): 13. 1865 [1869].
Camptothecium arenarium (Lesq.) Jaeg., Ber. Thatigk. St. Gallischen Naturwiss. Ges. 1876-77: 315. 1878.
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Distribution
On soil, rocks, or soil covering rocks, in dry or moist areas; Baja California (on the Pacific side).—Northwestern Mexico to British Columbia.
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