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Published In: Moss Flora of North America 1: 157. 1938. (Moss Fl. N. Amer.) Name publication detail

Project Name Data (Last Modified On 10/22/2013)
Acceptance : Accepted
Project data     (Last Modified On 10/22/2013)
Nomenclature: W. jamaicensis (Mitt.) Grout, Moss Fl. N. Amer. 1: 157. 1938.
Tortula jamaicensis Mitt., J. Linn. Soc., Bot. 12: 147. 1869.
Trichostomum chlorophyllum C. Muell., Linnaea 38: 635. 1874.
T. purpusii Card., Rev. Bryol. 36: 73. 1909.
T. angustinerve Card., Rev. Bryol. 37: 122. 1910.
Tuerckheimia angustinervis (Card.) Broth. in E. P., Nat. Pfl. (ed. 2), 10:     259. 1924.
Distribution: On soil, rock, walls, and bases of trees at low to moderate elevations; Baja California, Baja California Sur, Chiapas, Chihuahua, Coahuila, Distrito Federal, Hidalgo, Jalisco, Morelos, Nuevo Leon, Oaxaca, San Luis Potos’, Sonora, Tamaulipas, Veracruz. - Weedy and cosmopolitan.
Discussion: The peristome may be entirely wanting or reduced to a few yellow teeth hidden behind the annulus, or it may fall with the operculum. Plants lacking a peristome may appear to have remnants of a membrane at the mouth, as in sect. Hymenostomum. This membrane is usually present, however, in peristomate plants as well. The thinness of the capsule wall used by Andrews (1924) to separate W. controversa from W. hedwigii Crum (of sect. Hymenostomum) cannot be depended on, as Mexican specimens of W. controversa may have both thick capsule walls and peristomes. Weissia hedwigii is absent from Mexico, but a similar species, W. condensa (Voit) Lindb., is represented there. It has oblong-lanceolate leaves that are broad as compared with those of W. controversa. The type of Hymenostomum mexicanum can be considered an eperistomate example of Weissia controversa, but numerous specimens identified as H. mexicanum belong to W. condensa instead.
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Plants green above, brown below. Stems up to 10 mm high. Leaves 2.5-4 mm long, linear-lanceolate or occasionally ligulate-lanceolate, conspicuously broader and ovate to oblong at a half-sheathing base; margins sharply incurved, occasionally fragile and eroded in rectangular patches; costa with ventral epidermal cells quadrate and papillose, those on the dorsal surface elongate and smooth; upper cells 7-9 µm wide, with evenly thickened walls, bulging at the surface and covered by 4-6 bifid papillae; basal cells differentiated across the leaf, 13-17 µm wide and 3-5:1, with thick or thin walls. Dioicous. Setae 9-13 mm long, yellow- to red-brown, twisted clockwise; capsules 1.5-2.2 mm long, cylindric, yellow- to red-brown; exothecial cells in 1-2 layers, rectangular, ca. 25 µm wide and 3-4:1, rather thin-walled; annulus consisting of about 4 rows of cells; operculum 0.5-1.2 mm long, rostrate; peristome teeth long-ligulate, irregularly cleft, yellow, spiculose-papillose to spiral-ridged, consisting of 3-10 joints, joined at base as a low membrane hidden by the annulus. Spores 14-18 µm, brown, papillose.


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