88 EXPLANATION OF PLATES. 



Plate XVII. 



Fig. 1. Verrucaria conferta^ Fl. Hib. (p. 39.) 



A. Vertical section of thallus and apothecium. b. Sporidia. 



2. Verrucaria cinerea, Pers. (p. 39.) 



A. Vertical section of thallus and apothecium. b. b. Sporidia. 



3. Verrucaria epidermidis, Ach. (p. 40.) Upper 



fig. on Birch bark. Lower fig. minute puncti- 

 form state on Birch bark. 



A. Vertical section of thallus and apothecium. b. Sporidia. 



4. Verrucaria epidermidis j3. analeptay Hook. (p. 



40.) On Oak bark. 



A. Vertical section of thallus and apothecium. b. Sporidia. 



5. Verrucaria punctiformiSy Pers. (p. 41.) 



A. A. A. Vertical section of thallus and apothecium. b. Sporidia. 

 c. Ascus with enclosed sporidia. 



Plate XVIIT. 



Fig. 1. Verrucaria olivacea, Pers. (p. 42.) 



A. Vertical section of thallus and apothecium. b. Sporidia. 



2. Verrucaria fusif or mis. (p. 42. 



A. A. Vertical section of thallus and apothecium. b. Sporidia. 



3. Verrucaria Lyellii, (p. 42.) 



A. Vertical section of thallus and apothecium. b. b. Sporidia. 



4. Verrucaria ffemmata, Ken. (p. 43.) 



A. Vertical section of thallus and apothecium. b. b. Sporidia. 



5. Verrucaria alba. (p. 43.) 



A. Vertical section of thallus and apothecium. b. b. b. Sporidia. 



