Dryopteris celsa (W. Palmer) Knowlton

Dryopteris celsa is a fertile allotetraploid derived from hybridization between D . goldiana and D . ludoviciana . Dryopteris celsa hybridizes with six species; hybrids can usually be identified by the dark-striped scales.

Leaves monomorphic, dying back in winter, 65--120 × 15--30 cm. Petiole 1/3 length of leaf, scaly at least at base; scales scattered, dark brown or tan with dark central stripe. Blade green, ovate-lanceolate, gradually tapering to tip, pinnate-pinnatifid, herbaceous, not glandular. Pinnae ± in plane of blade, lanceolate-ovate; basal pinnae linear-oblong, much reduced, basal pinnules longer than adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal; pinnule margins crenately toothed. Sori midway between midvein and margin of segments. Indusia lacking glands. 2 n = 164.

Ala., Ark., Del., Ga., Ill., Ky., La., Md., Mich., Mo., N.J., N.Y., N.C., Pa., S.C., Tenn., Va., W.Va.

Seepage slopes, hammocks and logs in swamps, mostly on the Piedmont and Coastal Plain; 50--800m.

Dryopteris goldiana (Hooker ex Goldie) A. Gray subsp. celsa W. Palmer, Proc. Biol. Soc. Wash. 13: 65. 1899

Dryopteris celsa, the log fern, is a perennial fern in the family Dryopteridaceae. It naturally occurs on rotting logs and the rich soil of swamps and wet woodlands. Its native range includes the southeastern United States.

Dryopteris celsa là một loài thực vật có mạch trong họ Dryopteridaceae. Loài này được (W. Palmer) Knowlt., Palmer & Pollard miêu tả khoa học đầu tiên năm 1900.