LICHENS OP' IOWA. jc 



PHYSCIA [DCFr.) Th. Fr. 



P. sPECiosA ( Wnlf.. Ar/i. ) ^^yi. Trees and mossy rocks. 

 Fa3-ette. Bremer. Clayton, Linn. 



P. iivpoLEUCA i Mil hi. I Tuck. Trees. Fayette, Bremer, 

 Clayton, Johnson. 



P. GRANui.iFERA ( Ac/i. ] Tiick. Trees. Favette. Bremer, 

 Shelby, Johnson. Linn, Story. 

 Apparently common and al\va}s sterile. 



P. COMOSA {Esr/iz.'.\ ."\"i7. ^fnuipcrus z'/rti-iiiiaiia. along bluffs. 

 Fayette. 



P. AQUiLA [^Ac/i. ) JCyl. Rocks. Fayette. 



Probably the variety dctoiisa occurs, but the specimens are 

 not sure. 



P. PULVERULEXTA { Sc/ircl). ) ATyl . Trees and rocks. Fay- 

 ette. Bremer. Cla\ton. Shelb^■. Johnson. Linn, Story. 



P. sTELEARis {L.\. Trecs and rocks. Fa3ette, Clayton, 

 Bremer, Winneshiek, Shelby. Johnson. Linn. Story, Floyd 

 and Dickinson. 



P. TRiBACiA [Ac/i.^ Tuck. Fayette. Bremer. Clayton. Shelby, 



Johnson, Linn, Story. 



The apothecia are sub-pedicellate as are some in the Tuck- 

 erman herbarium, though not agreeing with the description in 

 this respect. 



P. c^siA ( Hoffin. ) ^^3''^- Stones. Fayette, Johnson, Bremer. 

 .Some of the material collected agrees quite as well with P. 

 astroidca. 



P. OBSCURA ! Ehrh. \ \yl. I'rees and rocks. Fayette, 



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



We haye one form approaching P. aqniki and another 



approaching P. sctosa with no intermediate conditions. Some 



sent by Mr. IL M, Kelly runs into P. adghitiuata. 



