Monographs Details: Plagiogyria
Authority: Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.
Description:Genus Description - Terrestrial; rhizome stout, slightly erect, naked; roots wiry; stipe bases flared, persistent, covering the rhizome, with inconspicuous pneumatophores; young fronds slimy before opening; fronds dimorphic, the sterile ones pectinate, crown-forming, erect to slightly spreading, glabrous at maturity, chartaceous, margin remotely serrulate at pinna base to regularly serrulate at pinna tips, veins free; fertile fronds with contracted pinnae, covered with sporangia on lower surface, margin scarious and recurved, protecting the sporangia when young; annulus oblique, uninterrupted by stalk; spores tetrahedral, smooth to tuberculate.
Discussion:Type: Plagiogyria euphlebia (Kunze) Mettenius [=Lomaría euphlebia Kunze].
Plagiogyria is a genus of ferns of high elevation cloud forests. It has about 50 species, mostly of southern and eastern Asia. In the New World there are at most six species (Lellinger, 1971), only one being widespread, or it might be construed as a single American species with several very local variants. The characters of vein branching and toothing used to separate the American species seem too tenuous to hold with confidence. The genus is thought to be perhaps related to the Osmundaceae, but it is so distinct that it is maintained in its own family and that placed insertae sedis. Plagiogyria is distinguished by the dimorphic fronds, lack of indusium, flared stipe bases, and pneumatophores.
References: Copeland, E. B. 1929. The fern genus Plagiogyria. Philipp. J. Sci. 38: 377-415; Lellinger, D. B. 1971. The American species of Plagiogyria sect. Carinatae. Amer. Fern J. 61: 110-118.