146 
IOWA ACADEMY OF SCIENCES. 
Verrucaria fuscella (Turn.) Ach. Lich. Univ. 289. 1810. 
On sandstone, rare. 
Pyrenula gemmata (Ach.) Naeg. in Hepp. Flecht, Eur. 
51. 1867. 
On trees, frequent. 
Pyrenula nitida (Schrad.) Ach. Mong. in Berl . Magaz. 
21.1812. 
On oaks, rare. 
Pyrenula quinqueseptata (Nyl.) Tuck. Genera Lich. 
178. 1872. 
On trees, frequent. 
