Spores (as measured in Hoyer's Solution) 27--32 µm. 2 n = 72.

Acidic rocks such as sandstone, basalt, and granite, very rarely on calcareous rocks; 0--3000 m; B.C., N.B., Nfld., N.S., Ont., Que.; Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., Ga., Ill., Ind., Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., Wash., W.Va., Wis., Wyo.; Mexico in Chihuahua; Europe; Asia; Africa; Australia.

In southern Illinois Asplenium trichomanes subsp. trichomanes hybridizes with A . rhizophyllum to produce A . × shawneense (R. C. Moran) H. E. Ballard (R. C. Moran 1981).

Common Name: maidenhair spleenwort Wetland Status: FAC

From Flora of Indiana (1940) by Charles C. Deam

Infrequent to rare in pockets of soil on cliffs in the area of sandstone outcrops of the state.

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Indiana Coefficient of Conservatism: C = 10

Wetland Indicator Status: UPL