68 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



994 Asplenium filix-fxmina, Bernh. Ames; Keokuk; Winnesheik 

 county; Emmet county; Delaware county; Muscatine county; Iowa 

 City; Charles City. The van Michmixii, Mett., in Polk and Story 

 counties. 



995 Camptosonis rhizophyllns, Lk. l^es Moines; Ackley; Fort 

 Dodge; Delaware county; Iowa City; Decorah; Monticello; Musca- 

 tine county. 



996 Camptosonis rliizop/iylli/s, Lk., var. inten/icdins, Arthur. Mus- 

 catine county. 



997 /V/c'i^opfcr/s /u\va,i:[o/iopfi'ra, Fee. Delaware county ; Muscatine 



county; Iowa City. 



998 Phei:;optcris calcarea, Fe'e. Decorah. 



999 Aspidiiii/i acrostichoides, Swz. Muscatine county. 



1000 Aspidiiii/i T/u'Iypfcris, Swz. Winnesheik county; Scott 

 county; Iowa City. 



100 1 Aspidium Goldiaiium, Hook. Muscatine county. 



1002 Aspidinin spinu/osiim, ':^WA. Keokuk; Muscatine county. 



1003 CvstDph-ns l>itli>if era, l^ernh. Charles City; Winnesheik coun- 

 ty; Delaware county; Muscatine county; Iowa City. 



1004 Cystopteris frai:;Uis, Bernh. Very common, as also the var. 

 dentata. Hook. 



1005 OiiOiha sciisihilis, L. Not uncommon from Charles City, 

 Ames, and Keokuk, eastward. 



1006 Onoclca Strnthioptcris, Hoffm. Throughout the eastern half 

 of the State as far south as Iowa City; also in Emmet county. 



1007 Woodsia obfnsa, Torn Johnson .county ; Delaware county; 

 Winnesheik county; Boone county; Muscatine county. 



1008 Osmunda Claytoniaiia,\.. Charles City; Winnesheik county; 

 Ames; Iowa City. 



E(^)UISETACE.^. 



1009 Eqiiisctiini arvcnsc, \ .. Very common. 



1010 Kqitisetiim liiiiosiii)i,\.. Story county; Scott county; Emmet 



county. 



Id I Equisetiiin robustiim, K. V>\:. Keokuk ; Clinton county. 



10 1 2 Eijuiscf 11)11 hiei)iah% E. Common. 



1013 luiiiisdiiin licvv^atimi, A. \h: Emmet county. 



The following descriptions are of species not given in Gray's Man- 

 ual, 5th edition, nor in Underwood's "Our Native Ferns and their 

 Allies:" 



