y2 NATUK.VL HISTORY BlLLE'rJN. 



LI. ST. 



Since it is generally admilted that a t^•pical Lichen is a 

 dual organism, a fungus and an alga, the classitication of 

 Lichens is not an easy matter. The fungus portion in our 

 known Iowa Lichens "is ascomycetous and we might without 

 great impropriety classify them as ascomycetous Fungi. Yet 

 it has seemed best to the writer to follow Tuckerman"s Syu- 

 ops/s and treat them as a distinct class as follows: 



L I C H E N E S. 



F.VMiLiKs rsXEEI, PA R.MEL I EI, Etc., Etc. 



As the list is not in any sense descriptive, save as indicating 

 habitat, it has not been thou<jht advisable to introduce a kev. 

 It will be understood that families not quoted are not repre- 

 sented so far in Iowa collections. 



Fam. USNEEl. 

 R A M A L I X A . Ir//.. Z)e A\>t. 



R. CALicAKis (Z.) /v'. Trees. Fa\ette. Bremer. 



R. CALiCARis (Z.) Fr.. i(ir. fraxlnea. Tv'. Trees. Fayette, 

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



R. CALICARIS (Z.) jFr.. var. fastigiata Z)-. Trees. Fayette, 

 Bremer. Clavton. Shelby. Johnson. Stor}-, Winneshiek, Linn, 

 Emmet. This evidently passes into the var. canalictilata Fr. 



R. CALICARIS (Z.j Fr.. var. farinacea, Schtvr. Sandstone. 

 Clayton. 



C E T R A R I A I Ach. ) Fr. MuU. 



C. ciliaris {Ach.). Dead wood. Fayette. Bremer, Clavton, 

 Winneshiek. Johnson. 



