Athyrium filix-femina (L.) Roth LADY FERN. (As Asplenium filix-femina), "Foster's Flat, Ontario," Day (1888). Ontario, Niagara Parks System (as Asplenium filix-femina), Cameron (1895). (As A. filix-femina), "area of the Falls," Day (1901). Ontario: reported from the Parks, Hamilton, 1943. Ontario (as var.michauxii (Spreng.) Farw.: "Niagara Falls, W. J. Potter (TRT), Heimburger (1955). ). (As Athyrium filix-femina) "Dufferin Islands, [Niagara] Glen," sight records, Yaki (1970).

var. angustum (Willd.) Lawson.

New York: Buckhorn Island State Park; southeastern woods south of East-West River Parkway, wet woods, with Matteuccia struthiopteris. P. M. Eckel July 25, 2004.

Ontario: (as var. michauxii) 1/2 mile S of Beck Rd. overpass on the QEW W side; low, moist secondary woods. P. M. Eckel Oct. 1, 1983 (BUF); Navy Island just S of Niagara Falls, north west and northern river margins.P. M. Eckel. May 13, 1998

Athyrium pycnocarpon (Spreng.) Tidest. (= Athyrium angustifolium (Michx.) Milde. Asplenium angustifolium Michx.) NARROW-LEAVED SPLEENWORT Ontario, Niagara Parks System (as Asplenium angustifolium), Cameron (1895). Ontario: "Niagara Glen, [T.J.] Ivey, Aug. 8, 1908; 17/6, 1905; Niagara Falls, Wm. Scott, June 25, 1898, Heimburger (1955). "Ontario: gorge of River at Niagara Glen," Zenkert (1934).

Range: Ont-swPQ. Status: Endangered in New Hampshire. Threatened in Wisconsin. Rare in Minnesota. Protection: Protected by law in New York, Argus & White (1977). Not listed as rare in the Niagara Frontier Region by Zander & Pierce (1979). Zenkert (1934) (as A. angustifolium) suggests it is "rather infrequent. Low rich woods, also in limestone areas; rather abundant (locally)."

Athyrium thelypteroides (Michx.) Desv. SILVERY SPLEENWORT. Ontario, Niagara Parks System (as Asplenium thelypteroides Michx.), Cameron (1895). (As A. achrostichoides) "area of the Falls," Day (1901). (As Athyrium acrostichoides (Sw.) Diels), "Ontario: near the Whirlpool (Day, Cat. of Niag. Fl.)," Zenkert (1934).

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