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Published In: Bericht über die Thätigkeit der St. Gallischen Naturwissenschaftlichen Gesellschaft 1871–72: 354 (Gen. Sp. Musc. 1: 202). 1873. (Ber. Thätigk. St. Gallischen Naturwiss. Ges.) Name publication detail
 

Project Name Data (Last Modified On 10/22/2013)
Acceptance : Accepted
Project data     (Last Modified On 10/22/2013)
Nomenclature: H. involuta (Hook.) Jaeg., Ber. Thštigk. St. Gallischen Naturwiss. Ges. 1871-72: 354. 1873.
Gymnostomum involutum Hook., Musci. Exot. 2: 154. 1819.
G. tortula Schwaegr., Sp. Musc. Suppl. 2(2): 78. 1826.
Hyophila tortula (Schwaegr.) Hampe, Bot. Zeit. 4: 267. 1846.
Trichostomum bescherellei Schimp. ex Besch., MŽm. Soc. Sci. Nat. Cherbourg 16: 177. 1872.
Hyophila bescherellei (Schimp. ex Besch.) C. Mÿll., Flora 58: 538. 1875.
H. elata Card., Rev. Bryol. 36: 75. 1909.
H. subdenticulata Card., Rev. Bryol. 36: 76. 1909.
H. dentata Card., Rev. Bryol. 40: 36. 1909.36.
Distribution: On moist, calcareous rock or concrete at low to moderate elevations; Campeche, Chiapas, Colima, Durango, Guerrero, Hidalgo, Jalisco, MŽxico, Michoac‡n, Morelos, Nayarit, Nuevo Le—n, Oaxaca, Puebla, QuerŽtaro, Quintana Roo, San Luis Potos’, Sinaloa, Tabasco, Tamaulipas, Veracruz, Yucat‡n. - Mexico; Central America, South America, and the West Indies; widespread in eastern United States; southwestern United States; central Europe; China, Burma, India, Japan, Indonesia, and Oceania.
Discussion: The propagula vary in shape and size, and considerable differences are found in dentation of the upper margins of leaves.
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Plants dark-green above, brown or red-brown below, rarely branched. Stems up to 10 mm high; central strand strong, occasionally hollow; hyaloderm not or weakly differentiated. Propagula often present on brown, axillary stalks, stellate to dentate-ellipsoidal, up to 120 (rarely 300) µm long. Leaves tubulose and incurved when dry, spreading when moist, rosulate-tufted, up to 2.5 mm long, spatulate, broadly channeled across the leaf and shallowly grooved at the costa, rounded to rounded-obtuse at the apex, somewhat sheathing at the narrow base and weakly auricled; margins plane to broadly incurved, entire to denticulate or distantly dentate in the upper 1/4; costa subpercurrent to ending in an apiculus, often red-brown, in section semi-circular, with both stereid bands strong, guide cells in 1 layer, hydroids absent, and epidermal cells on the ventral surface quadrate or, more commonly, short-rectangular, weakly convex or rarely bulging as much as the laminal cells, the epidermal cells of the dorsal surface elongate and smooth; upper cells ± arranged in longitudinal and oblique rows, mammillose-bulging on the upper surface, weakly convex on the lower, 8-10 µm wide, rounded-quadrate to hexagonal, thin- to evenly thick-walled; basal cells differentiated across the leaf or in median regions, rectangular, 13-20 µm wide and 2-4:1, with walls thin or evenly thickened. Dioicous. Setae 6-7 mm long, red-brown to yellow-brown; capsules 2-3 mm long, cylindric from a poorly differentiated neck, red-brown; exothecial cells rectangular, 20-25 µm wide and 2-5:1, thick-walled; annulus of 2-3 layers of vesiculose cells, deciduous in fragments or remaining attached to the urn or operculum; operculum 0.5-0.6 mm long, with cells straight-rowed. Spores 7-9 µm, weakly papillose.
 

 

 
 
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