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Published In: Moss Flora of North America 2(3): 203. 1935. (Moss Fl. N. Amer.) Name publication detail

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Pohlia wahlenbergii is usually a robust species commonly found on soil in wet, seepy areas. The plants have a whitish, glaucous-green color when living, and its field aspect is very much like Philonotis fontana, which grows in similar places. Central American collections of P. wahlenbergii lack sporophytes and the plants have dark-red stems with distant, well-spaced leaves. In this form it closely approaches some expressions of P. papillosa, but that species can be distinguished from P. wahlenbergii by its mammillose exothecial cells or the presence of numerous gemmae in the upper leaf axils. Microscopically, the broad (some cells 12 μm wide), usually lax, median leaf cells of P. wahlenbergii distinguish it from all other members of the genus in Central America.

Illustrations: Schwaegrichen (1816, Pl. 70); Bruch and Schimper (1839, Pl. 354); Husnot (1889, Pl. 62); Dixon and Jameson (1896, Pl. 42 H); Grout (1906, Pl. 46); Brotherus (1923, Fig. 48); Bartram (1949, Fig. 71 D–F); Nyholm (1958, Fig. 97 A); Abramova et al. (1961, Pl. 145 4–7); Lawton (1971, Pl. 103 6–17); Flowers (1973, Pl. 75 1–9); Smith (1978, Fig. 179); Crum and Anderson (1981, Fig. 237); Ireland (1982, Pl. 158); Shaw (1982a, Figs. 28 & 29); Orbán and Vajda (1983, Fig. 357); Reese (1984, Fig. 35 H–I); Li (1985, Fig. 72 9–17); Noguchi (1988, Fig. 193 A); Nyholm (1993, Fig. 111 A); Sharp et al. (1994, Fig. 386); Jóhannsson (1995, Pl. 25). Figure 63 E–K.
Habitat: On soil, moist banks or wet rocks along trails or streams; 1000–2700 m.
Distribution in Central America: GUATEMALA. Huehuetenango: Standley 82705 (F); Quezaltenango: Standley 83645 (F); San Marcos: Steyermark 36523 (F); Suchitepéquez: Steyermark 35362 (F). COSTA RICA. Alajuela: Crosby & Crosby 6305 (CR, MO). PANAMA. Bocas del Toro: Allen 5067 (MO, PMA).
World Range: Subarctic America, Western and Eastern Canada, Northwestern, North-Central, Northeastern, Southwestern, South-Central, and Southeastern U.S.A.; Mexico; Central America; Caribbean, Western and Southern South America; Subantarctic Islands; Northern, Southwestern, Middle, Southeastern, and East Europe; Siberia, Russian Far East, Caucasus, Middle Asia, Mongolia, China, Eastern and Western Asia; Macaronesia, Northern Africa, Western Indian Ocean; Indian Subcontinent; Australia, New Zealand.


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Pohlia wahlenbergii (Web. & Mohr) Andr. in Grout, Moss Fl. N. Amer. 2(3): 203. 1935. 

 Hypnum wahlenbergii Web. & Mohr, Bot. Taschenb. 280. 1807. Bryum wahlenbergii (Web. & Mohr) Schwaegr., Sp. Musc. Frond., Suppl. 1(2): 92. 1816. Webera wahlenbergii (Web. & Mohr) Fuernr., Flora 12: 35. 1829. Mniobryum wahlenbergii (Web. & Mohr) Jenn., Man. Mosses W. Pennsylvania 146. 1913. Protologue: Germany. In arena insull. Danubii pr. Ratisb.[Ratisbona] Funck. (ante 12 annos). 

Plants slender to robust-sized, dull, glaucous-green to whitish when wet, yellow-green to brownish when dry, in loose tufts. Stems 4–30 mm high, dark red, simple or irregularly forked; rhizoids reddish brown, papillose-roughened. Leaves distant or crowded above, 0.7–2.0 mm long, erect to erect-spreading, soft, not contorted when dry, lanceolate to ovate-lanceolate, long decurrent; apices acute; margins plane to reflexed below, serrulate above; costae yellow above, reddish at base, percurrent; upper cells oblong- to narrowly-rhomboidal, thin- or firm-walled, 70–100 x 10–15 μm, marginal cells longer and narrower, basal cells longer, broader and laxer, narrowly rectangular to rhomboidal. Dioicous. Sporophytes unknown from Central America. “Setae 25–40 mm long, slender and flexuose; capsules pendulous, 1.5–2 mm long, shortly oblong-ovoid from a short neck; annulus none; operculum low-conic, apiculate; exothecial cells hexagonal, with somewhat wavy outlines, not or lightly thickened at the corners; stomata immersed; peristome teeth brown or yellow-brown; endostome pale-yellowish with a high basal membrane, perforate segments, and nodulose cilia in 2's and 3's. Spores 15–20 μm, minutely papillose” (Crum & Anderson 1981).



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