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Published In: Species Muscorum Frondosorum, Supplementum Primum (2): 107–109, pl. 75 [right]. 1816. (Sp. Musc. Frond., Suppl. 1) Name publication detail
 

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Acceptance : Accepted
Project data     (Last Modified On 2/22/2011)
Discussion:

Bryum pallescens has ovate‑lanceolate leaves with strongly revolute leaf margins, short, firm‑walled leaf cells and a stoutly excurrent costa. It is generally autoicous with male and female inflorescences at the ends of separate branches, but occasionally synoicous inflorescences occur. Bryum pseudotriquetrum differs from it in having decurrent leaves, a percurrent to shortly excurrent costa and mostly synoicous inflorescences. The only Central American collections of this species are sterile and therefore very difficult to distinguish from Bryum caespiticium Hedw. or B. lisae De Not. var. cuspidatum (Bruch & Schimp. in B.S.G) Marg. The former is dioicous the latter is synoicous and both have a longer excurrent costa and longer leaf cells than B. pallescens.

Illustrations: Schwaegrichen (1816, Pl. 75); Bruch and Schimper (1839, Pl. 359); Dixon and Jameson (1896, Pl. 44 F); Andrews (1935, Pl. 90 B); Nyholm (1958, Fig. 131); Abramova et al. (1961, Fig. 180); Ochi (1970, Fig. 20); Lawton (1971, Pl. 94 1–6); Flowers (1973, Pl. 80 6–7); Gangulee (1974, Fig. 481); Smith (1978, Fig. 194 1–4); Crum and Anderson (1981, Fig. 257 A–H); Ireland (1982, Pl. 176); Orbán and Vajda (1983, Fig. 379); Li (1985, Fig. 79 6–7); Ochi (1985, Fig. 8 G–K); Noguchi (1988, Fig. 209 B); Nyholm (1993, Fig. 161); Sharp et al. (1994, Fig. 358); Allen (1995, Fig. 9); Jóhannsson (1995, Fig. 82). Figure 149.
Habitat: On soil, steep road bank at edge of disturbed forest; 1300 m.
Distribution in Central America: GUATEMALA. Alta Verapaz: Croat 41460 (MO).
World Range: Subarctic American, Western and Eastern Canada, Northwestern, Northeastern, and Southwestern U.S.A.; Mexico; Central America; Western and Southern South America; Subantarctic Islands; Northern, Middle, East, Southwestern, and Southeastern Europe; Siberia, Russian Far East, Middle Asia, China, Eastern Asia, Caucasus, Western Asia; Northern Africa, West‑Central and East Tropical Africa; Indian Subcontinent; New Zealand.

 

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Bryum pallescens Schleich. ex Schwaegr., Sp. Musc. Frond., Suppl. 1(2): 107. 1816. Bryum pseudotriquetrum var. pallescens (Schwaegr.) Dix., Stud. Handb. Brit. Mosses (ed. 3): 364. 1924. Protologue: Germany, Switzerland, Austria. In subalpinis Sudetum et Helvetiae legerunt Schleicher et Car. Ludwig, Salisburgi Flörke, in alpinis graniticis Styriae ego, vere et aestate florens. 

Plants small to medium-sized, green to yellowish green, sometimes tinged red, in loose or dense tufts 1–30 mm high; rhizoids moderately developed at base, papillose. Leaves 1.5–3 mm long, spirally twisted and appressed when dry, erect‑spreading when wet, ovate to ovate‑lanceolate, not decurrent; apices long-acuminate; margins strongly revolute to the apex, strongly limbate, entire; costae strong, long-excurrent; upper cells oblong‑hexagonal, firm‑walled, 26–44 μm long, basal cells short-rectangular to quadrate near the margins, firm‑walled, 30–50 μm long. Autoicous or synoicous. Sporophytes not known from Central America. Setae to 20–40 mm long, red‑brown. Capsules 3–4 mm long, clavate, constricted at neck, pendent; opercula conic‑apiculate, 0.5 mm long; exostome teeth brown to yellowish brown, papillose, endostome hyaline to yellowish, basal membrane to ½ of exostome teeth length, segments broadly perforate, smooth to lightly papillose, cilia 2–3, nodose or appendiculate. Spores 18–36 μm, papillose (Allen 1995).

 

 

 
 
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