Pellaea ternifolia subsp. villosa
Contr. Univ. Michigan Herb. 19: 43. 1993.
Petiole rounded or slightly flattened adaxially in distal portion; rachis villous, especially in axils of pinnae; pinnae with hairs scattered along main veins abaxially; largest ultimate segments (excluding terminal pinnae) usually more than 18 mm; spores averaging 46–53 µm diam. 2n = 116.
Phenology: Sporulating summer–fall.
Habitat: Rocky slopes and ledges, on igneous substrates
Elevation: 2300–2700 m
The only record of Pellaea ternifolia subsp. villosa from the flora is provided by a single plant collected in the Davis Mountains of western Texas.
"thick" is not a number.