EXPLANATION OF PLATES. 



91 



Fig. 



Plate XXIII. 

 1. Verrucaria linearis, (p. 52.) 



A. Thallus and apotbecia in profile. 



thallus and apothecia. 

 ridia. 



. B. B. Vertical section of 

 c. Ascus and paraphyses. d. Spo- 



2. Verrucaria umhrina, Ach. (p. 52.) 



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



3. Verrucaria codonoidea, (p. 53.) 



A. Thallus and apothecia in profile, b. Section of thallus and 

 apothecia. c. Sporidia. 



4. Verrucaria Sprucely Ch. Bab. V. pyreno- 



j)horay Acn. (pp. 54 and 76.) 



A. Thallus and apothecia in profile, from Barnaghee mountain. 

 B. B. Vertical sections of thallus and apothecia. c. apo- 

 thecium, as seen from above, d. Sporidia. 



5. Verrucaria Sjprucei, Ch. Bab., from Cumberland. 



(p. 54.) 



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



0. Verrucaria Sprucei, Ch. Bab., Pyrenees, (p. 54.) 



A. Sporidium. . 



Plate XXIV. 



Fig. 1. Verrucaria papulosa, Ach. (pp. 54 and 77.) 



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



2. Verrucaria lucens, Tayl. (p. 55.) 



a. Thallus and apothecia in profile. b. Vertical section of 

 thallus and apothecium. c. Sporidia. 



3. Verrucaria mutabilis, Borr. (p. 55.) 



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



4. Verrucaria irrigua, Tayl. (p. 56.) 



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



5. Lichen immersus, E. Bot. (p. 59.) 



A. Vertical section of patellula. b. Sporidia. 



6. Verrucaria erysiboda, Tayl. (p. 56.) 



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



