EXPLANATION OF PLATES. 85 



Plate XI. 



Fig. 1. Fertusaria Hutchinsice. (p. 30.) 



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



2. Pertusaria nov. spec. (?) from Highlands of Scot- 



land, in herb. Borrer. (p. 30.) 



A. A. Vertical sections of thallodal wart and apotheciuni. n. 

 Sporidium. c. Ascus with enclosed sporidia. 



3. Parmelia scrujposa. Fries, (p. 30.) 



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



4. Parmelia scruposa, /3. hryophila, Fries, (p. 30.) 



A. Vertical section of thallus and patellula. e. Sporidia. 



Plate XII. 



Fig. 1. Thelotrema lepadinum, Ach. (p. 31.) 



a. Vertical section of thallodal wart and apotheciuni. a. Thallodal 

 wart. h. Receptacle, c. Nucleus, b. Sporidia. 



2. Thelotrema lepadinmiy j3. rupestre, T. and B. 



(p. 32.) 



A. Vertical section of thallodal wart and apotheciuni. b. Spo- 

 ridium. 



3. Thelotrema exanthematicum, Acii. (p. 32.) 



A. A. Vertical sections of thallodal wart and apothecium. b. b. Spo- 

 ridia. c. Nucleus and receptacle dissected out from thal- 

 lodal wart. a. a. a. Lacerated divisions of the upper part 

 of the receptacle, h. Semi-opaque membrane of the recep- 

 tacle, c. Thickened base. 



