IJCIIENS OF IOWA. 173 



E V E R N I A Ar/^., Ma ,1,1. 



E. I'KUNASTRi (/-.) AcJi. A single collection was made on 

 yiiiiipcriis virginicDia. Fa\ette. 



USNEA [Dill) Ach. 



U. i;aki;ata \L.\ Fr. Trees. Fayette. Very rare, only 

 three or four specimens of the typical papillate-scabrous 

 form being found. 



U. BARBATA (Z.) Fr.. vciv. I'LORiDA, Fr . Trees. Fayette, 

 Bremer. Cku'ton. Shelb\', Johnson, Linn, Storx-, Winneshiek. 



I'. iiARBATA \L.) Fr.. var. iiirta. Fr. Trees. Fayette. 



U. BARBATA \L.\ Fr.. I'cir. I'BicATA. Fr. Trees. Story. 



U. ANCUJLATA Ar/i. On yiin/'prrus vir<j;i)iia)ia grovying along 

 bluffs. Fayette. Winneshiek. 



U. cAyiiRNOSA Tuck. Collected by E. W. D. Hohyaw and 

 now in herbarium of Dr. John W. Eckfeldt. 



Earn. PARMELIEI. 



T H E L (J 8 C W I S T E S Xorm., Emend. 



T. ciiRysopiiTHALivius [L.') A^uriu. Trees. Fa}'ette. Bremer, 

 Clayton, Winneshiek, Shelby, Story, Dickinson. This is 

 especially abundant on yiiiripcriis virginiana., growing along 

 bluffs. 



T. I'AKiirnNus (/..) Norm. On trees Winneshiek, Bremer, 

 Fayette, Shelby. The last collection contained the only 

 good specimen of the species, the others approaching too 

 nearh' the next. 



T. poLNCARPUs [E/ir/i.]. Dead trees. Fa3'ette, Bremer, 

 Cla\ton. Shelb\', Johnson. Linn. Story, Floyd and Dickinson. 



T. LVciiNEUs (^'\V. ). Trees and rocks. Fayette, Bremer, 

 Clayton, Shelb\', Story. Floyd and Dickinson. Ours is the 

 large form. Probably we also haye the yariet}' laciiuoMi. 



