Pellaea ternifolia subsp. ternifolia
Petiole grooved or flattened adaxially in distal portion; rachis glabrous or with a few widely scattered hairs; pinnae completely glabrous; largest ultimate segments (excluding terminal pinnae) usually less than 18 mm; spores usually 39–45 µm diam. 2n = 58.
Phenology: Sporulating summer–fall.
Habitat: Rocky slopes and ledges on igneous substrates
Elevation: 2200–2600 m
Tex., Mexico, Central America, South America, Pacific Islands (Hawaii)
In the flora, this subspecies is known only from the Chisos Mountains in western Texas.
"thick" is not a number.