420 IOWA ACADEMY OF SCIENCE Vol. XXV, 11)18 



Lansing:; uncommon or rare; seemingrly preferring the bluffs 

 near Mississippi river. A specimen from Jackson county also 

 is at hand. 



Asplenium filix-foemijia- (L.) Bernh. (Athyrium filix-foemina> 

 (L.) Ro'th). "Winneshiek, Allamakee, Clayton, and Dubuque 

 counties. Woods and thickets, the most abundant fern and 

 very common throughout this region as well as all the wooded 

 portions of the state. 



Asplenium acrostichoides Sw. (Asplenium thelypter aides 

 Miehx. Athyrium thelypieroides (Michx.) Desv.) Allamakee 

 and Dubuque counties. Mr. Orr WTites: "two small colonies 

 near Waukon, one at Lansing, probably rare in the county. ' ' 



Adiantiim pedatum L. Winneshiek, Allamakee, Clayton, and 

 Dubuque counties; rich woods; common. 



Pteris aquilina L. (Pteridium aqmlinum (L.) Kuhn). Winne- 

 shiek, Allamakee, Clayton, and Dubuque counties; quite com- 

 mon. The habitat is medium dry or moist foil along hillsides 

 covered with thickets or woods. 



Pellaea airopurpurea (L.) Link. Winneshiek, Allamakee, 

 Clayton, and Dubuque counties. Found also in the neighboring 

 co'unties of Fayette and Delaware. This species prefers lime- 

 stone cliffs but grows on sandstone. Mr. Orr notes: "Abund- 

 ant throughout Allamakee county on all limestone rocks. Shows 

 most luxuriantly where rocks are moist and shaded. Grows 

 abundantly in rock cuts of C. M. & St. P. R. R. west of Mc- 

 Gregor. I have seen very fine specimens near Harpers Ferry, 

 Iowa." 



Pellaea- stelleri (S. G. Gmel.) Watt. (Pellaea gracilis Hook. 

 Cnyptogramma, stelleri (Gmel.) Prantl.) Winneshiek, Allama- 

 kee, Clayton, and Dubuque counties. Frequent to common in 

 limestone or sandstone cliffs. ]\Ir. Orr writes for Allamakee 

 county : ' ' very abundant in moist soil in pockets and crevices 

 of a ledge of St. Peter sandstone, three miles east of Waukon, 

 Iowa, also found at stations near Myron on Yellow river, grow- 

 ing in moist soil in crevices of Trenton limestone". 



Cheilanthes lanuginosa Nutt. {C. Feei Moore. C. gracilis 

 (Fee) Mett.) Winneshiek, Allamakee, Cla^-ton, and Dubuque 

 counties ; exposed dry ledges of Oneota limestone, common. This 

 species is abundant on the face of rocky cliffs of a prominent 

 liill in Allamakee county known locally as "Big Elephant". 



