Plate 20 





|-^^>*>>v ■^-• 









X25 



X80 



X460 



X 700 



ARTHONIA ASTROIDEA Aoh. 



a. Plant on bark. b. Portion of thallus and apothecia. c. Vertical section 



of thallus. d. Vertical section of apothecia. c. Ascus and paraphysei 



/. Spores. 



