PLANTS OF IOWA 121 



PTERIDOPHYTES 



VASCULAR CRYPTOGRAMS. 



OPHIOGLOSSACE^. ADDER 'S-TONGUE FAMILY. 

 BOTRYTHIUM, Sw. 



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

 In rich woods, frequent. 



OSMUNDACE^J. ROYAL FERN FAMILY. 

 OSMUDA, L. 



1507. 0. regalis* L. Royal Fern. 

 Low, marshy ground. 



1508. 0. cinnamonea, L. Cinnamon Fern. 

 Boggy places. 



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

 Hilly woods, frequent. 



POLYPODIACE^. FERN FAMILY. 

 POLYPODIUM, L. 



1510. P. vulgare, L. Polypody. 

 Rocky ledges. 



Adiantum, L. 



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

 In ravines. 



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

 Shady woods, frequent. 



Pteridium, Scop. 



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

 Common in open woods and thickets. 



Cryptogramma, R. Br. 



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

 On limestone ledges. 



