Woodsia obtusa subsp. occidentalis
Contr. Univ. Michigan Herb. 19: 56. 1993.
Stems short- to long-creeping, individual branches usually 3–5 mm diam. Blade finely cut, 2-pinnate-pinnatifid. Proximal pinnules of lower pinnae usually deeply lobed or pinnatifid. Spores averaging 35–42 µm. 2n = 76.
Phenology: Sporulating summer–fall.
Habitat: Cliffs and rocky slopes (rarely terrestrial), found on a variety of substrates but mostly sandstone and granite
Elevation: 200–500 m
Ark., Kans., Mo., Okla., Tex.
Woodsia obtusa subsp. occidentalis hybridizes with subsp. obtusa sporadically throughout the region of sympatry; the hybrids are sterile triploids with malformed spores.