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Woodsia obtusa subsp. obtusa  
Family: Woodsiaceae
[Alsophila perriniana Spreng., moreAspidium obtusum (Spreng.) Sw., Cystopteris albescens Link, Cystopteris obtusa (Spreng.) Presl, Cystopteris perriniana (Spreng.) Link, Cystopteris vestita Presl, Physematium obtusum (Spreng.) Hook., Physematium perrinianum (Spreng.) Presl, Physematium vestitum (Presl) C. Presl, Polypodium obtusum (Willd. ex Kaulf.) Kuhn, Woodsia obtusa f. darlingtonii (Stowell) M.Broun, Woodsia obtusa var. darlingtonii Stowell, Woodsia perriniana (Spreng.) Hook. & Grev., Woodsiopsis obtusa (Spreng.) Shmakov]
Woodsia obtusa subsp. obtusa image
  • FNA
  • Resources
Michael D. Windham in Flora of North America (vol. 2)
Stems compact to short-creeping, individual branches usually 5--10 mm diam. Blade coarsely cut and evidently 2-pinnate. Proximal pinnules of lower pinnae usually shallowly lobed or merely dentate. Spores averaging 42--47 µm. 2 n = 152. Sporulating summer--fall. Cliffs and rocky slopes (rarely terrestrial); found on a variety of substrates including both granite and limestone; 0--1000 m; Ont., Que.; Ala., Ark., Conn., Del., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis. D. F. M. Brown (1964) hypothesized that tetraploid Woodsia obtusa might be an autopolyploid derived from W . oregana . Recent isozyme and spore ornamentation studies indicate, however, that these species are not closely related, and the discovery of a diploid cytotype of W . obtusa suggests a different (albeit autopolyploid) origin for this taxon (M. D. Windham 1993). Tetraploid subsp. obtusa crosses with diploid subsp. occidentalis ; the resulting triploids are sterile and have malformed spores. It also hybridizes with W . oregana subsp. cathcartiana to form the sterile tetraploid hybrid known as W . × kansana Brooks.

Woodsia obtusa subsp. obtusa
Open Interactive Map
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
Woodsia obtusa subsp. obtusa image
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.