THE PERITHBCIUM OP MELIOLA. 21 



Fig. 30. Horizontal section above the base of same. — Zeiss J. 



Fig. 31. Somewhat older stage in vertical section. The ascogenous 



cells in the centre are enlarging at the expense of those 



around. — Zeiss J. 

 Fig. 32. Portion of outer wall with disorganised cells lining it. — 



Zeiss J. 

 Fig. 33. Vertical section through nearly ripe Perithecium, showing 



asci and spores embedded in the gelatinous mass produced 



by the disorganisation of the unemployed cells. — Zeiss D. 

 Fig. 34. Portion of outer wall of latter in vertical section. — Zeiss J. 

 Fig. 35. Vertical — not median — section through ripe Perithecium 



(and portion of epidermis of host-plant), showing crowds of 



spores. 



Fig. 36. Thin slice from top of similar Perithecium. A pore-like 

 spot is seen in the centre of the radial marking. 



Figs. 37, 38 and 39. Various stages in the development of the asci 

 and spores. — Zeiss J. 



Fig. 40. Germinating spores. — Zeiss D. and E. 



Fig. 41. Portion of mycelium of a species oiMeliola found on Pavetta, 

 showing mycelium, setce, and young Perithecia. — Zeiss J. 

 and D 



Figs. 42 and 43. Development of Perithecia and extrusion of spores. 



