IOWA ACADEMY OF SCIENCES. 141 



to the Mississippi basin, reaching its greatest development 

 in northeastern Iowa, where it is a common inhabitant of 

 oak woods, either in sandy or clay soil. The associated 

 plants are Adiantum pcdatmn, Pedicularis canadensis, 

 Anemonella thalictroides and Cypripedluni pubescens. At 

 Steamboat Eock it is more common than at Ames. At Ames 

 it is about extinct. It is more frequent at Muscatine and 

 at Lebanon in southeastern Iowa. 



Iowa: Muscatine — Beppcrt; Ames, "one mile north- 

 west of Iowa State College, in rich woods" — Hitchcock; 

 Wildcat Den — Ikill ; Myron — Miss King; Lansing — Miss 

 King; Postville — "common in Allamakee county" — Orr; 

 Lebanon — Sample; Ames — Carver; Monticello — " woods," 

 Bessey ; New Albin — Panunel; Steamboat Rock — Pantmel. 



Southwestern Wisconsin: La Crosse — Pammel; Bloom- 

 ingdale — Miss Pauiniel and 3Iiss King. 



Southeastern Minnesota: Pine Creek — Pammel. 



Cheilanthes tomentosa Link. 



There is one specimen in the College collection taken 

 from a cultivated specimen, collected by Mr. Carver, and 

 presumably from southeastern Iowa; but the specimen 

 contains no further data. If this came from Iowa it is 

 north of its range. 



Cheilanthes lanuginosa Nutt.; Hooker. Sp. Fil. 2: 99. 1858. 



This small fern occurs on limestone rocks, generally 

 along the Mississippi river and tributaries, but it is not 

 common. It is associated with Pellaea atropurpurea. 



Iowa: Allamakee County "Oneota limestone — bluffs" — 

 E. Orr; Winneshiek County~L(^?/'?.S'; North McGregor — 

 Pammel. 



Pelhea gracilis Rook. Sp. Fil. 2: 138. 1858. 



The distribution of this fern is rather limited, and so far 

 as we know, it is always found on sandstone ledges. The 

 shady sandstone ledges that underlie the magnesian lime- 



