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254 Acrostichum ilvense. ''Linn. Sp. Pl. ed. 2, p''. 1528.

Nephrodium lanosam. Michaux, Amer. 2, p. 198.

Habitat in rupibus Europæ et Americæ borealis. (v. v.) ♃.

2. hyperborea. W. frondibus pinnatis, pinnis triangularibus oblongisve inciso-pinnatifidis: lobis integerrimis paucifloris: antico baseos productiore. Tab. 38 (XI).

Polypodium hyperboreum. ''Swartz, Synop. Fil.'' 39. ''Willden. Sp. Pl. 5, p''. 197. Eng. Bot. 2023.

Polypodium arvonicum. Smith, Fl. Brit. 3, p. 1115.*

Polypodium ilvense. ''Withering, Arrang. ed. 3, t''. 3, p. 774.

Acrostichum hyperboreum. ''Liljeblad in Act. Stockholm.'' 1793, p. 201, t. 8*.

Acrostichum alpinum. ''Bolton, Fil. Brit. 76, t''. 42.

Ceterach alpinum. Lamarck et Decandolle, Fl. Fran. 2, p. 567.

Habitat in Europæ alpibus (v. v.) ♃.