IOWA PTERIDOPHYTA. 161 



Cystopteris buebifera (L.) Bernh. 



A common species, and one of the prettiest, in eastern 

 Iowa, growing on shaded limestone banks. It begins to 

 fruit in June, and endures longer than the preceding 

 species. Nearly all of the specimens in the herbarium 

 have the characteristic bulblets. The following counties 

 are represented: Allamakee (T. H. Macbride, Aug., 

 1893; T. E. Savage, June, 1899, young frond); Winne- 

 shiek (T. J. Fitzpatrick, July, 1896; T. E. Savage, May, 

 1899, sterile) ; Cerro Gordo (July, 1896, sterile) ; Clinton 

 (L. H. Pammel, Sep., 1896); Jones (J. E. Cameron, 

 July, 1895; T. H. Macbride, Aug., 1895); Delaware 

 (J. E. Cameron, Sep., 1897); Johnson (June, 1881 and 

 1896); Webster (July, 1897). 



Family A SPIDIEiE J. Smith, Hk. Jour. Bot. (1841.) 



Genus PHEGOPTERIS Fee, Gen. Fil., p. 242. 



(1850-2). 



PHEGOPTERIS PHEGOPTERIS (L.) Undenvood. 



Rare, in low woods, etc. The herbarium contains but 

 one specimen from Iowa, collected by Prof. T. H. Macbride 

 in Delaware county in July, 1878. It is in full fruit, and 

 is a typical specimen. 



PHEGOPTERIS HEXAGONOPTERA {Mx .) Fee. 



Locally common in the eastern part of the State on 

 wooded slopes in leaf mould, etc. The following counties 

 are represented in the herbarium: Johnson (July, 1881, 

 in fine fruit) ; Delaware (J. E. Cameron, Oct., 1897, with 

 mature fruit) ; Muscatine (Pine creek and Sweetland creek, 

 Oct., 1900; the former scantily fruited, the latter in full, 



