298 GEOLOGY OF OHIO. 



36. VERRUCARIA Pers. 



Verrucaria -muraus Ach. 



Limestone rock, Plain City ( Madison Co.) W. C. Werner. , 



Verrucaria nigrescens Pers. 



"On rocks," near Cincinnati, Thos. G. Lea (Cat.) 



Verrucaria rtjpestris Schrad. 



On limestone rocks, Muskingum Co., Wm. C. Werner; on rock, Ashtabula Co.. 

 E. E. Bogue. 



37. PYRENULA. 



Pyrenuxa gemmata (Ach.) Naeg. 

 On Beech, Oberlin, E. E. Bogue. 



Pyrenuxa glabrata (Ach.) Mass. 



On old bark, Rendville (Perry Co.) , Fairfield Co., W. A. Kellerman ; Champaign 

 Co., Wm. C. Werner. 



Pyrenuxa nitida Ach. 

 On bark, common. 



