y^ NATURAL HISTORY BULLETIN. 



T. coNCOLOR [Dicks.). Trees and rocks. Winneshiek. Fa\'- 

 ette. Bremer. Ckiyton. Shelby, Linn. Johnson. Floyd. 



FARM ELI A {Ach.) De Not. 



P. PERLATA [Ach.]. Shelby. Story. Ours is not very good, 

 though it seemed to belong here after careful comparison. 



P. PERFORATA ( yticq.) Ach. Trccs. Fa3ette. Bremer. Cla}-- 

 ton, Linn, Johnson. Sterile specimens of what seems to be 

 the variety hypotropa were collected. 



P. CETRATA Ach. I'rees and rocks. Fayette. Bremer. Clay- 

 ton Johnson, Linn, Flo3'd. Emmet. 



P. CRLNTTA Ach. Trccs and rocks. Clayton. Bremer; Fay- 

 ette, Johnson, Linn, Story. Floyd, and Dickinson. 



P. TiLiACEA [Hoffm.) Flocrk. Trees and rocks. Fayette. 

 Clayton, Bremer, Shelby, Johnson, Linn, Storv. Winneshiek. 



P. BORRERi Turn. Trees. Fayette, Bremer. Clayton, Win- 

 neshiek. Shelby. Story, Dickinson. 



P. BORRERI Til)-)}., var. RUDECTA Tiick. Trees. Fayette, 

 Shelb}', Johnson. Linn. Floyd, Dickinson. 



P. SAXATiLLs \L.) Fr. Trees and rocks. Fayette. Bremer, 

 Clayton. Winneshiek. Johnson. Linn. Story. 



P. OLivACEA [L. ) Ach. Trees. Fayette. Dickinson. This 

 species seems to be very rare in the State, and the small 

 amount of material seen was all sterile. 



P. CAPERATA [L.) Ach. Trecs and rocks. Winneshiek, 

 Fayette, Clayton. Bremer, Shelby, Johnson, Linn, Story, 

 Floyd. Emmet. 



P. coNSPERSA [Ehrh. \ Ach. Rocks. Fayette, Bremer, 

 Story, Emmet. 

 Apparently rare and usually sterile. 



