214 NATURAL HISTORY BULLETIN. 



Equisetum l.Eyigatum A.Braun. (p. 155). 



No specimens were found in the counties under con- 

 sideration, but sterile fronds were collected en route in 

 Delaware county, — an additional locality. 



BOTRYCHIUM VIRGINIANUM (L.) Swz. (p. 156). 



Rather young plants with green fruit were quite common 

 in both counties. 



OSMUNDA CLAYTOXIAXA L. (p. 158). 



Finely fruited plants were common in both counties. 



OxOCLEA SEXSIBILIS L. (p. 159). 



Young sterile fronds were collected in Dubuque county. 



Struthiopteris struthiopteris (L.). (p. 16o). 



Young sterile fronds were rather common in both 

 counties, and a last year's fruiting frond was taken in 

 Dubuque. 



Cystopteris fragilis (/..) Bernh. (p. 160). 



Plants with young fruit were common in both counties. 



Cystopteris bulbifera (Z.) Bernh. (p. 161). 



Common in both counties. The fruit was just beginning 

 to appear. 



Phegopteris robertiaxa (Hoffni.) Fee. (p. 162). 



A few sterile fronds were just beginning to appear in 

 moss-beds on rocky slopes in Dubuque county. 



Xephrodium cristatum (L.) J/.r. (p. 162). 



A few plants with partly unrolled fronds were found in a 

 low swampy place in Dubuque county. Some of the fronds 

 displayed very young fruit. 



Nephrodium spixulosum (Rets.) Desv. (p. 163). 



Rather rare, on rocky slopes in Dubuque county. Very 

 young fruiting fronds were just appearing. 



