LICHEN'S OF IOWA. 87 



V. FUSLKi.ivA Fr. Calcareous rocks. Fayette. Johnson. 

 V. RUPESTRis Fr. Calcareous rocks. l'\ayette. 

 V, :\iUKAFis Ac]i. Calcareous rocks. Fayette. Johnson. 

 V, PVRKNOPiiORA {Ac]i.\ \\L Calcareous rocks. Fayette. 



PYRENULA [Ach.] Xccg, ds Hcpp. 



P. I'UNCTiFORMis \Ac]i.) X(-Ci(. Trecs. Fayette. Bremer. 



P. (JEM.MATA [Ach.) X<^cg-. Trecs. Fayette, Clayton. 



P. iivAFOSPORA Xxl. Trees. Fa^-ette. 



P. fp:ucoplaca ( Wallr.) Khr. Trees. Fayette. 



P. CFABRATA {^Ack.) Miiss. Trccs. Fa\ette. The thallus 

 is not typical. 



P. NiTiDA Acli. Trees. Fayette. Linn. 



P. TiiELENA Ach. Trees. Fayette. Bremer. 



P. EACTEA [J/ass.) Trees. Fayette. 



DISTRIBUTION AND HABITAT 01^ IOWA EICIIENS. 



As to State distribution little can be written, for while the 

 list contains collections from twelve counties, well distributed 

 over the state, only one count v has been carefully studied. 

 The writer collected 180 species and varieties in Fayette 

 count}'. The number from no other county exceeds 75, and 

 •eleven counties only furnished 16 lichens not found in Fayette 

 ■count}". It is probable that the prairie portions of Iowa have 

 not the rich lichen-flora of this broken and wooded county. 

 But the counties alon"; the eastern border of the state are 

 doubtless all as interesting, and no doubt would furnish some 

 interesting lichens. A careful study of the lichens of southern 

 Iowa should bring more sub-tropical forms, and the western 

 part of the state doubtless contains a few western species. 



One interesting feature of habitat shown in the list is the 

 large number of species found on calcareous rocks and earth. 



