94 EXPLANATION OF PLATES. 



Plate XXIX. 



Fig. 1. Pyrenothea niveo-atra. (p. 67.) 



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



2. Fyrenothea mollis, (p. 67.) 



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



3. Pyrenothea lithina. (p. 68.) 



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



4. Pyrenothea lutea. (p. 68.) 



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



5. Pyrenothea sulphur ea. (p. 69.) 



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

 Plate XXX. 



Fig. 1. Cliostomum corrugatum^ Fries, (p. 69.) 



a. Vertical section of perithecium. b. Sporidia. 



2. Lecidea Ehrhartiana, Ach. (p. 69.) 



A. Vertical section of patellula, b. Sporidia. 



3. Parmelia [Lecanora) varia, Fries, (p. 69.) 



A. Sporidia. 



4. Striyula Babinytonii, Berk. (p. 70.) 



A. Vertical section of perithecium. b. Sporidia. 



