BY G. P. DARNKLL-SMITH. 881 



Plate lxxx\ . 

 Fi.i^.3. — Smfaee-view of a pyrnidiuni. sliowint^ the ostiole in the centred 



( > 480). 

 Fig. 4. — Section of the testa of an orange -seed which has been penetrated 



bytlie liypha^ of P/ionta cift-intr/ia, and in which two small pycnidia 



have been produced. 

 Fig..>. — Young hj'phte, showing elongated cell; ( x 4S0). 



Plate Ixxxvi. 

 Fig.6. — Old hyphre, showing dark brown-coloured cells, which are more or 



less circular, Mith numerous protul)eranees; ( x 480). 

 Fig. 7. — Spores in various stages of growth : a, a j'oung spore showing two 



nuclei; b, c, d, spores about to germinate, .showing vacuoles and 



fragments staining deeplj' with hfcmatoxylin. 

 Fig.8. — "x" spores arranged in rouleaux. 

 Fig.9. — "x" spores showing highly refringent dots. 

 Fig. 10. — Pycnospores germinating in nutrient solution, showing stunted 



hyph^e with a tendency to bud; ( x 480). 

 Fig, 11. — Pj'cnospores germinating normally in orange-rind-extract, shoM - 



ing germ-tubes, septa, and granular contents; ( x 480). 

 Fig. 12. — Establishment of a mycelium from a germinating spore; ( x 480). 



Plate Ixxxvii. 



Fig. 13. — Formation of a pycnidium from the mycelium growing in a hang- 

 ing drop. The hyph^ of the mycelium are shown anastomosing b^' 

 the union of adjacent branches or by the direct fusion of one hypha 

 with another by a branch; ( x 480), 



Figs. 14, 15. — Formation of lobulated branches, first stages in the develop- 

 ment of a pycnidium; ( x 480). 



Plate Ixxxviii. 



fie/. IH. — Formation of lobulated branches, first stages in the development 

 of a p3''cnidium; ( x 480]. 



Fig. 17. — Section through a young pycnidium, showing the development of 

 septa in the lobulated branches, and the establishment of a pseudo- 

 parenchyma; ( X 480), 



Fig. 18. — Section through an older pycnidium, showing the protoplasm, 

 with granular contents, lining the cell-walls of the pseudo-paren- 

 chyma; ( x480). 



Plate Ixxxix. 

 Fig. 19. — Section through a pj'cnidium at a later stage showing dissolution 

 of the cell-walls of the pseudo-parenchyma before the establishment 

 of spore- bearing hyphte; \ x 480). 



