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FNA | Family List | FNA Vol. 2 | Dryopteridaceae | Woodsia

7b. Woodsia obtusa subsp. occidentalis Windham, 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 ┬Ám. 2 n = 76.

Sporulating summer--fall. Cliffs and rocky slopes (rarely terrestrial); found on a variety of substrates but mostly sandstone and granite; 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.


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