Pellaea atropurpurea

This is a widespread species, most often found on limestone substrates in the northern parts of its range, but often on igneous substrates in the southwest. I've even seen it on red sandstone in Oklahoma.

Plant habit in the Patagonia Mts., 3/18/05.

Abaxial view of a pinna in the Chisos Mts., 12/31/04.

Plant habit in Ice Canyon in the Organ Mountains, 30 Jan 2005.