102 AMERICAN FERN JOURNAL 
PELLAEA STELLERI (S. G. Gmel.) Watt. (Pellaea 
gracilis (Michx.) Hook. Cryptogramma Stelleri (Gmel.) 
Prantl.) Winneshiek, Allamakee, Clayton, and Du- 
buque Counties. Frequent to common in limestone 
or sandstone cliffs. Mr. 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, growing in moist soil in crevices 
of Trenton limestone.” 
CHEILANTHES LANUGINOSA Nutt. (C. féei Moore. 
C. gracilis (Fée) Mett.) Winneshiek, Allamakee, Clay- 
ton, and Dubuque Counties; exposed dry ledges of 
Oneota limestone, common. This species is abundant 
on the face of rocky cliffs of a prominent hill in Alla- 
makee County known locally as ‘Big Elephant.”’ 
PoLypopruM vuLGARE L. Allamakee and Clayton 
Counties. Cliffs, frequent, even common on shaded 
outcrops of St. Peter sandstone in Allamakee County 
and on the pictured rocks at McGregor, Clayton County. 
The species has also been reported from Winneshiek 
County. 
SALVINIACEAE 
AZOLLA CAROLINIANA Willd. This species is found 
floating in quiet waters. It was found by Miss King 
in Allamakee County (Plant World, 5: 225). I have 
specimens from Muscatine and Louisa Counties, from 
bayous along the Mississippi River, farther south than 
the region under consideration. I also have specimens 
collected by J. P. Anderson from Lake Wabonsi in 
Fremont County, the southwest corner county of the 
state. This species is rarely collected, but it is prob- 
ably more frequent than collections indicate, being 
overlooked. 
