THE LICHEN-FLORA OF CHICAGO AND VICINITY. 43 



124, P, nitida, Ach. Thallus pale yellowish or olive, w^axy, 

 smooth; apothecia black, in size medium to large, though 

 sometimes small, invested by the thallus, globose; perithecium 

 black. Spores fuscous. Sphasria, Weigel, Obs. 45. (1772). 

 Verrucaria, Ach. L. U 279. Nyl, etc. 



On oaks and maples throughout our territory, perhaps not 

 abundant, yet it may be in some places. The very pale 

 thallus will identify its location more easily. American 

 specimens vary greatly in size. 



125. P, glabrata, Ach. Thallus whitish, thin; apothecia variable 

 in size, black, hemispherical, conoid; perithecium black. 

 Spores fuscous. Ach, Syn. 791. Nyl. Pyren, 47. 



On oaks near Elgin and Joliet; apparently not common. 

 Some Florida specimens are of extraordinary size, making 

 their proper position questionable. 



