Polypodium colysoides Maxon & Copel.
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Authority
Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.
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Family
Polypodiaceae
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Scientific Name
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Description
Species Description - Rhizome creeping, 4-5 mm diam.; rhizome scales 2-4 mm long, castaneous with margin lighter, very thin, minutely denticulate; fronds 18-44 cm long, distant, mostly 1-2 cm apart; stipe ½-2/3 the frond length, stramineous, deeply grooved, with scales dense, appressed, light brown to castaneous, ovate to ovate-lanceolate; rachis and costae stramineous, prominent; blade pinnate, 9-11 cm wide; pinnae 2-4 pairs with terminal pinna conform, pinnae linear-lanceolate, constricted near base, apex acuminate, base dilated to surcurrent and slightly more decurrent, largest pinnae 6.0-7.5 cm long, 1.0-1.8 cm wide; upper surface essentially glabrous with rare scales along midvein; lower surface with castaneous, lanceolate or lanceolate-attenuate scales 0.5-1.0 mm long; veins not evident (strongly netted); sori elongate (2-)3-5(-9) mm long, in larger specimens often interrupted with a long streak and 12 dots; sporangia glabrous.
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Discussion
Type. Mexico. Veracruz: Atoyac River, Ojo de Agua, Copeland 135 (MICH!; isotypes GH!, UC!, US!). The synonymy of this species with P. bradeorum Rosenstock by Evans and Mickel (Brittonia 21: 255-260. 1969) was in error. Polypodium colysoides is clearly related to the scaly-bladed Polypodiums, whereas P. bradeorum, distinct by its thinner texture, very irregular sori and epiphytic habit, represents an isolated element in the genus, and was given generic rank (Pseudocolysis) by Gómez (Brenesia 10/11: 116. 1977).
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Distribution
On shaded limestone rocks in wet montane forest; Cuicatlán; 900 m. Mexico (Ver, Oax, Chis); Hond.
Mexico North America| Honduras Central America|