Pellaea atropurpurea (Linnaeus) Link

Purple cliff brake

Etymology Atro means dark, and purpurea means purple. See the description of the stipe.
Description Rhizome: short-creeping, orange-brown scales.
Frond: 50 cm high by 18 cm wide, evergreen, somewhat dimorphic, sterile shorter and less divided than fertile fronds, blade/stipe ratio: 2:1.
Stipe: dark purple to black, shiny, rounded above, scales uniformly reddish brown (or tan), linear, at base, vascular bundles: 1.
Blade: usually 2-pinnate at the base, but sometimes more or less, elongate-deltate, leathery, rachis hairy, sparsely villous below near midrib of ultimate segments.
Pinnae: 5 to 9 pair, bluish-green, lower pinnae stalked, upper sessile, a terminal pinna like the upper lateral ones; pinnules sessile or nearly so; veins obscure.
Sori: oblong or linearly joined, submarginal, indusium: false, inrolled margins, sporangia: brown, maturity: early to late summer.
Culture Habitat: on calcareous rocks. Distribution: Guatemala to northeastern North America to Florida. Hardy to -30C, USDA Zone 4.
Distinctive Characteristics Similar to P. glabella, but differs in being taller, more upright, more divided, and particularly, the hairs on the rachis and costae.
Pteris atropurpurea Linnaeus
Pellaea atropurpurea var. cristata Trelease

Pellaea atropurpurea. Habit. More via the click-through link.  Photo: Chuck Griffith, on the site of the North American Rock Garden Society.
Pellaea atropurpurea
Pellaea atropurpurea. Here the fertile frond is shown as shorter, a reversal of reality; perhaps the Bush Administration is in town.  Illustration by Edgar Paulton, from How to Know the Ferns and Fern Allies, John T. Mickel, 1979 Wm. C. Brown Co.
Pellaea atropurpurea
Pellaea atropurpurea. a) sterile and fertile fronds, b) fertile pinna.  Illustration by V. Fulford from Ferns and Fern Allies of Canada, William J. Cody and Donald M. Britton, 1989, © Agriculture Canada.
Valid XHTML 1.0     Reports of errors and omissions appreciated: toms AT (please replace the AT with @)