92 EXPLANATION OF PLATES. 



Plate XXV. 



Fig. 1. Verrucaria subalbicans. (p. 56.) 



A. A. Vertical sections of thallus and apothecia. b. Sporidia. 



2. Verrucaria immersa, Hoffm. (p. 57.) 



A. Vertical section of thallus and apothecia. b. Sporidia, 



3. Verrucaria maura, Ac h. (p. 59.) 



A. A. Vertical sections of thallus and apothecia. b. Sporidia. 



4. Verrucaria rupestrisy Schrad. (p. 60.) 



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

 Plate XXVI. 



Fig. 1. Verrucaria patula. (p. 61.) 



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



2. Verrucaria epipolcea, Ach. (p. 61 .) 



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



4. Verrucaria margacea, Wahl. (p. 62.) 



A. Vertical section of thallus and apothecium. b. Upper sur- 

 face of thallus and apothecium. c. Under surface of de- 

 tached perithecium. d. Apothecium nearly covered by 

 the thallus, as seen from above, e. Sporidia. 



