20 H. MARSHALL WARD. 



Fig. 12. Young Perithecium seen from below (a), from the side (b), 

 and from one end (c). In all, the dark cell is the one 

 marked (A) in fig. 9 ; the remainder have resulted from 

 the growth and division of the cell (B). — Zeiss J. 



Figs. 13 and 14. Slightly later stages]? seen from below. The cell 

 (A) has become divided by a cross septuni. — Zeiss J. 



Figs. 15 and 16. Similar preparations seen from above and below. — 

 Zeiss J. 



Fig. 17. Somewhat more advanced Perithecium seen from the side. 

 The cells resulting from the division of A (" ascogenous 

 core ") are seen through those formed by B, which are 

 growing over them. — Zeiss J. 



Fig. 18. Somewhat more advanced stage. — Zeiss J. 



Fig. 19. Slightly later stage. The upper figure is seen from above, 

 the lower from below : the latter shows the " ascogenous 

 core." — Zeiss J. 



Fig. 20. Similar preparations seen from above (lower figure) and 

 below (upper figure). — Zeiss J. 



Figs. 21 and 22. Slightly advanced Perithecia cut by the razor. Tho 

 " ascogenous core " is exposed at the cut parts. — Zeiss E. 



Figs. 23 and 24. Similar preparations treated with chromic acid. 

 The "ascogenous core" is seen enveloped by the cells 

 forming the Perithecium-wall : all much swollen, and 

 fig. 23 slightly crushed. — Zeiss J. 



Fig. 25. More advanced Perithecium seen from outside and above 

 (x), below (y), and from the side (z). The radiating 

 hyphee (receptacle) spring from the external walls below. 

 — Zeiss E. 



Fig. 26. Portion of mycelium with young Perithecium seen from above 

 and below. — Zeiss E. 



Fig. 27. Somewhat older Perithecium. The razor has cut off one 

 side obliquely. — Zeiss J. (camera). 



Fig. 28. Vertical section through young Perithecium about this stage. 

 The ascogenous cells in the middle are distinguished by 

 their larger size and arrangement. — Zeiss J. 



Fig. 29. Oblique (nearly horizontal and median) section through the 

 same. — Zeiss J. 



