PLANTS OF IOWA 121 



PTERIDOPHYTES. 



VASCULAR CRYPTOGRAMS. 



OPHIOGLOSSACE^I. ADDER 'S-TONGUE FAMILY. 



BOTRYTHIUM, Sw. 



1506. B. virginianum, (L.) Sw. Moosewort. 

 In rich woods, frequent. 



OSMUNDACE^E. ROYAL FEEN FAMILY. 

 OSMUDA, L. 



1507. 0. regalis* L. Royal Fern. 

 Low, marshy ground. 



1508. 0. cinnamonea, L. Cinnamon Fern. 

 Boggy places. 



1509. 0. claytoniana, L. Clayton's Fern. 

 Hilly woods, frequent. 



POLYPODIACE-ffi. FEEN FAMILY. 



POLYPODIUM, L. 



1510. P. vulgare, L. Polypody. 

 Eocky ledges. 



ADIANTUM, L. 



1511. A, capillus-veneris, L. Venus-hair Fern. 

 In ravines. 



1512. A. pedatum, L. Maiden-hair Fern. 

 Shady woods, frequent. 



PTERTDIUM, Scop. 



1513. P. aquiiium, (L.) Kuhn. Brake. 

 Common in open woods and thickets. 



CRYPTOGRAMMA, R. Br. 



1514. C.*stelleri, (Gmel.) Prantl. Slender Cliff Brake. 

 On limestone ledges. 



