274 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



This paper would be incomplete were I not to lay a tribute at the 

 feet of one of the most noted botanists in this country, who for 

 several years has given me unstintedly of his time and with the most 

 gracious generosity has verified hundreds of analyses and has 

 analyzed as many more that were too difficult for me to determine. 

 This paper would not be possible were it not for Dr. L. H. Pammel, 

 of Ames. 



Polypodiaceae. 

 ADIANTUM. 



A. pcdatum : common in rich woods. 



PTERIS. 

 P. aquilina: Ryan farm ; river road. 



Pelleae. 



P. atropurpurca: three and one-half miles northwest of St. Ans- 

 gar. 



CRYPTOGRAMMA. 



C. Stellcri : Pierce's bridge. 



ASPLENIUM. 



A. Fili.v-fcinliui : once common on the streets of Osage, before the 

 old board walks were replaced by cement ; now found in rich woods. 



ASPIDIUM. 



A. novcboracensc : Indian Head bluff. 



A. Filix-mas: abundant in Pelton's woods, where the fronds are 

 often 3 to 4 feet long. 



CYSTOPERIS. 



C hulhifera : common along the banks of Cedar river. 

 C. fragilis : common along the banks of Cedar river. 



ONOCLEA. 



O. sensibilis : Pelton's woods; Lincoln township; river road. 



O. Strutheropferis: rare near Osage. The writer has a large bed 

 from a root found in Pelton's woods several years ago. But one 

 other specimen seen and that was in Spring Park. 



Osmundaceae. 

 OSMUNDA. 



O. Chiyt(>ni(nia : Lincoln township; Osage township. 



