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Published In: Öfversigt af Förhandlingar: Kongl. Svenska Vetenskaps-Akademien 19(10): 603–604. 1862[1863]. (Öfvers. Förh. Kongl. Svenska Vetensk.-Akad.) Name publication detail

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Epipterygium is a genus of 12 species (Crosby et al. 2000) found in the temperate areas of western North America, Europe and Asia and tropical areas of Latin America, Africa and Asia (Shaw 1984b). The genus is commonly found on soil in densely shaded, wet habitats. Epipterygium has delicate, complanate-foliate plants that are usually pale-greenish, often tinted pinkish or reddish. Most Epipterygium species have weakly costate, strongly dimorphic leaves with the dorsal leaves being smaller, narrower, and even more weaker costate than the lateral leaves. The species of Epipterygium are poorly defined, and the three Neotropical species (E. wrightii (Sull.) Lindb., Caribbean and Venezuela, E. immarginatum, and E. mexicanum) exhibit nearly continuous gradation in terms of plant size, leaf dimorphism and leaf border development (Shaw 1994). The genus was revised for the neotropics by Shaw (1984b). Temperate members of Epipterygium closely resemblance some species of Pohlia and for that reason the genera are sometimes synonymized.  


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Epipterygium Lindb., Öfvers. Förh. Kongl. Svenska Vetensk.-Akad. 19: 603. 1862.  

Plants small, dull or glossy, pale, glaucous-green to pinkish or reddish green in loose tufts; stems forked or simple; rhizoids sparse, reddish brown, lightly papillose. Leaves dimorphic, lateral leaves in 2–3 rows, obovate to broadly elliptic, acute, sometimes decurrent, dorsal leaves in 1–3 rows, smaller and narrower than the lateral leaves, lanceolate to linear-lanceolate acute to shortly acuminate; margins bordered or elimbate, plane, entire to obscurely serrulate above; costa ½ to _ the leaf length in lateral leaves, shorter in dorsal leaves; cells broadly rhombic, rhomboidal or linear, lax or firm, thin-walled, alar cells undifferentiated. Dioicous. Perigonia terminal, bud-like.  Setae reddish orange, smooth. Capsules cylindrical to pyriform, inclined to pendent; exothecial cells collenchymatous; stomata superficial; opercula conic-apiculate; annuli rudimentary or revoluble; peristome double, exostome densely and finely papillose, endostome lightly papillose, basal membrane to ½–_ of exostome teeth length, segments well-developed, broadly perforate, cilia 1‑3, stout, nodose. Spores lightly papillose. Calyptra not seen.


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