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FNA | Family List | FNA Vol. 2 | Pteridaceae | Pityrogramma

1a. Pityrogramma calomelanos var. calomelanos (Linnaeus) Link

Leaves 25--120 cm. Petiole black, dull, glabrous or sparsely scaly proximally. Blade elongate-triangular to ovate-lanceolate, 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.

Ditches in forested areas; 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.


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