ADDENDA. 77 



PAGE 



54. Verrucaria papulosa. 



I have in Plate XXIV figured the sporidia as they occurred 

 in the specimens before me. JBut there is everything 

 in the external appearance of this plant to lead one to 

 infer that an examination of other and better speci- 

 mens, in which the sporidia may be more mature, would 

 induce us to add this plant to Verr. pyrenophora^ Ach. 



55. Verrucaria mutabilis. 



Adde syn. Verrucaria macularis, y. acrotella^ Schaer. 

 Enum. 214. 



5G. Verrucaria irrigua. 



See remarks under Segestrella thelostonm, 



57. Verrucaria immersa. 



Adde syn. Verrucaria rupestris, Schaer. Enum. 217. 



59. Verrucaria maura. 



Adde syn. Pyrenula maura, Schaer. Enum. 209. 



61. Verrucaria epipolcea. 



Adde sjm. Verrucaria epipolaa, a. Schaer. Enum. 218. 



62. Verrucaria margacea, 



Adde syn. Pyrenula margacea, Schaer. Enum. 211. Pyre- 

 nula submersa, Schaer. Enum. 209. 



Verrucaria nigrescens, 



Adde syn. Pyrenula nigrescens, Schaer. Enum. 219. 



63. Verrucaria elceina. 



Adde syn. Pyrenula elcsina, Schaer. Enum. 208. 



64. Verrucaria epigaa, 



Adde syn. Thromhium epigceum, Schaer. Enum. 222, 

 tab. viii. fig. 4. b. c. 



Verrucaria HooJceri, 



Adde syn. Lecidea Hookeri, Schaer. Enum. 102. Cer- 

 tainly not a Lecidea. Our Plate XXVII will show its 

 true structure. 



