286 DU. LAUDER LODSAY OX ABTnONIA MKLASPEllMELLA. 



3. Until which time it is convenient to assemble them in a 

 provisional and transitional order of Mmffo-Uchenes, 



EXPLANATION OF PLATE VI, 



Figs. 1 to 6. Arthonia melaspermellay NyL 



1. Nat. size. 



2. Greatly magnified. 



a, h. ApotLccia. 



c. Pycnides, 



3. Diagrammic section through 



a, h, Apothecia. 

 c. Pycnides. 



4. Section of Hymenium (Apothccium), mag. 425. 



a. Thecse. J, c, Paraphyses. 



d, Ilypothecial tissue. 



5. Spores, mag. 425. 



6. Section of a Pycnidium. 



tf. Stylospores. 

 h, Sterigmata. 



Fig. 7. Arthonia pruinosay Ach., var. spilomatica^ Fw*. 



a, h. Steriermata 1 /. x> • i- 

 ' ,^ V of a Pycmdium. 



c. Stylospores J 

 Fig, 8. Arthonia pruinosa^ Ach. 



r 



a. Steriffmatai r a • 



_ -^ ° . tot a Spermogoniuni. 



o. Spermatia J 



Figs. 9, 10. Arthonia astroidea^ Ach., var. Swartziana, Ach, 



o, 5. Steriffmata 1 r t» • i- 

 ' « , I of a Pycmdium. 



c. Stylospores J 



Fig. 11. Arthonia astroidea^ Ach. 



o. Perithcoiumi .■•'*'!*i** 



5. Sterigmata Vof a Spermogonium. 

 c. Spermatia J 



