Pityrogramma calomelanos var. calomelanos
Leaves 25–120 cm. Petiole black, dull, glabrous or sparsely scaly proximally. Blade elongate-triangular to ovatelanceolate, 2-pinnate-pinnatifid, sometimes 3-pinnate proximally, densely white-farinose abaxially. Pinnae narrowly triangular, pinnately lobed or divided, flat surfaces in plane of blade. Pinnules short-stalked or sessile, lanceolate, margins serrate to lobed near base. Spores with perispore reticulate and with equatorial flange.
Habitat: Ditches in forested areas
Elevation: 0–20 m
Introduced; Fla., Mexico, West Indies in the Antilles, Central America, South America, widely naturalized in tropical Africa
Pityrogramma calomelanos var. calomelanos is commonly cultivated in greenhouses. In Florida, it is known from a small number of sites in Hillsborough and Polk counties, where it possibly escaped from cultivation. Pityrogramma calomelanos var. austroamericana (Domin) Farwell (Costa Rica to Brazil) is characterized by yellow farina; P. calomelanos var. ochracea (C. Presl) R. M. Tryon (Honduras to Bolivia) possesses scattered trichomes instead of farinose indument.