Pohlia nutans (Hedw.) Lindb.
Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1): 1-452.
Species Description - Dull to ± shiny, slender to medium-sized plants. Stems simple when sterile, 3-10 mm high. Leaves lanceolate, acute, 0.7-1.4 mm long, 0.4-0.7 mm wide, erect to ± spreading, not or slightly decurrent; margins serrate to serrulate near the tip, recurved, reflexed, or plane; costa ending 1-4 cells below the apex, rarely at the apex or shortly excurrent; upper cells long, narrow, and ± thick-walled, 45-95 µm long, 7-10 µm wide. Paroicous. Inflorescences terminal on simple stems; bracts lanceolate to linear-lanceolate, up to about 2.5 mm long, with recurved margins serrate at the apex. Setae 1.5-2.5 cm long, orange; capsules inclined to 90-180°, 3-5 mm long, cylindric to narrowly pyriform, with a short to ± long neck; annulus revoluble; operculum convex to conic, acute or apiculate; exothecial cells elongate-rectangular, with slightly sinuose, evenly thickened walls; stomata superficial; exostome teeth triangular-lanceolate, long-acute, yellow-brown, ± coarsely papillose near the apex, more finely so below, bordered, trabeculate; endostome hyaline, the basal membrane about 1/2 the height ofthe exostome, the segments keeled, broadly perforate, the cilia 2-3, long, ± nodulose. Spores 16-21 µm, finely to moderately papillose.
P. nutans (Hedw.) Lindb., Musci Scand. 18. 1879.
Webera nutans Hedw., Sp. Muse 168. 1801.
Hypnum nutans (Hedw.) Web. & Mohr, Ind. Mus. Pl. Crypt. 3. 1803.
Bryum nutans (Hedw.) Turn., Muse Hib. 117. 1804.
Webera caespitosa Hoppe & Hornsch. in Hornsch., Flora 2:102.1819.
W. bicolorHoppe & Hornsch. in Hornsch., Flora 2: 102. 1819.
Bryum subdenticulatumBrxd., Bryol. Univ. 1: 634. 1826.
Webera canaliculata C. Miill. & Kindb. ex Macoun, Cat. Canad. Pl. 6:113.1892.
Bryum cucullatiforme Kindb., Eur. N. Amer. Bryin. 2: 387. 1897.
The single Mexican collection is poor and dusty-looking and except for its distributional interest worthy only of the trash basket. The species is recognized by its paroicous inflorescence, thick-walled leaf cells, and well-developed endostome with broadly slit segments and nodulose cilia. It is very common north of the border and very likely more widely distributed in Mexico than it would seem.
On soil (elsewhere, on rotten stumps, tree bases, and peat hummocks); Nuevo Leon (PotosO-—Mexico; widespread in the Northern Hemisphere, known also from southern South America, Antarctica, Australia, and New Zealand.
New Zealand Australia Oceania| Antarctica| Argentina South America| Chile South America| Mexico North America| North America| Europe| Asia|