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clumps in crevices. At present it is known to occur in Winne- 

 shiek, Allamakee, Clayton, Dubuque, and Jones counties. 



Pellaea atropurpurea Link. Cliff brake. Winter brake. 

 Rather frequent in eastern Iowa, extending westward at least 

 as far as central Iowa, occurring in crevices of cliffs. 



Pellaea gracilis Hook. SeEnder cliee brake. Known to occur 

 in twelve counties in northeastern and eastern Iowa. 



Asplenium ebeneum Ait. Ebony speeenwort. Muscatine 

 county, Ferdinand Reppert. A very rare Iowa fern. 



Asplenium angustifolium Michx. Narrow-eEavEd splEEn- 

 wort. Rather rare in eastern and northeastern Iowa (Allamakee 

 and Jackson counties). The species has also been collected in 

 Delaware and Muscatine counties. 



Asplenium thelypteroides Michx. SievEry splEEnwort. A 

 rather infrequent species, occurring in rich woods in eastern and 

 northeastern Iowa. 



Asplenium filix-foemina Bernh. Lady EErn. Common through- 

 out Iowa in rich woods. Varies greatly. 



Camptosorus rhizophyllus Link. Waeking fern. Frequent 

 locaMy in pockets of limestone or sandstone cliffs in the rougher 

 portions of the eastern half of Iowa. The type locality of the 

 variety intermedins Arthur is Muscatine county. 



Phegopteris hexagonoptera Fee. Broad beech fern. Rich 

 woods, frequent locally. Known from Allamakee, Delaware, 

 Scott, Muscatine, and Johnson counties. 



Phegopteris polypodioides Fee. Beech fern. Woods, rare. 

 Muscatine county, Ferdinand Reppert; Delaware county. Prof. 

 Macbride; Hardin county, Prof. Pammel; Fayette county, Miss 

 Carr; Allamakee county, Miss King. 



Phegopteris dryopteris Fee. Oak fern. Rich woods, rare. 

 Collected in Winneshiek, Allamakee, Fayette, Johnson, and Har- 

 din counties. 



Phegopteris calcarea Fee. Rich woods, rare. Apparently con- 

 fined to northeastern Iowa. Known to occur in Winneshiek, 

 Allamakee, Fayette, and Dubuque counties. 



Nephrodium thelypteris Desv. Marsh fern. Bogs, rather 

 infrequent. Known to occur in nine counties of Iowa, ranging 

 over eastern, northeastern, and central Iowa. 



