FERN FLORA OF NORTHEASTERN IOWA 413 



soil in timber growing on blnff sides near Deeorah. and south of 

 Waukon Junction and north of Lansing, and other similar lo- 

 calities. The species is rather rare even in localities where 

 found. 



Aspidium thelyptcris (L.) Sw. {Dryopieris thehjpteris (L.) 

 A. Gray.) Winneshiek and Allamakee counties; wet soil; plen- 

 tiful. This species is common on marshy islands of Mississippi 

 river and occasionally is found in sloughs in this region. The 

 writer also has a specimen from the neighboring county of Fay- 

 ette. 



Aspidium marginale (L.) ^w/Dryopteris marghudis (L.) A. 

 Gray). The only specimen the writer has from this region is 

 from Allamalvee coiuity, sent by JMr. Ellison Orr who Amtes: 

 "growing on a timbered, shady, steep north slope of a sandstone 

 bluff capped by limestone, about seven miles northeast of Post- 

 ville on Yellow river, only one colony — a fine one — discovered 

 so far in the county." This is a rare fern for Iowa. 



Phegopteris dryopteris (L.) Fee. (Dryopieris dr,yopteris (L.) 

 Britton). The writer has specimens from Winneshiek and Al- 

 lamakee counties which are referred here. The habitat is moist 

 rocky woods. 



Phegopteris rohertiana (Hoffm.) A. Br. {Phegopteris calca- 

 reci Fee. Dryopteris rohertiana (Hoffm.) C. Chr.) This species 

 closely simulates the preceding of which it may be a variety or 

 only a form. Specimens are at hand from Winneshiek and Al- 

 lamakee counties. The specimens from Allamakee county are 

 from Mr. Orr who writes: "very abundant where collected on 

 mossy, partly shaded, rocky talus at foot of, and on north side 

 of high and steep bluff along south side of Yellow river, the only 

 station I know in Allamakee county." 



Phegopteris hexaganoptera (Michx;) Fee. (Dryopteris hexa- 

 gonoptera (Michx.) C. Chr.). Allamakee county, the waiter's 

 specimen is from Mr. Orr who reports: "a few scattering 

 plants on north side of wooded bluff, Waul^on Junction, Iowa." 



Camptosorus rhizophylhis (L.) Link. Winneshiek, Allamakee, 

 Clayton, and Dubuque counties; rocky limestone soil in woods; 

 abundant; often growing on the tops of large detached boulders 

 at the bottom of deep, shaded ravines. 



Aspleninm angnstifoliunv Michx. (Asplenium pycnocarpon 

 Spreng.) Allamakee county; in rich shaded wood soil on slopes 

 and at the foot of tim'bered bluffs at Waukon Junction and at 



