g6 EXPLANATION OF FIGURES IN PLATES. 



Plate III. — Phyllactinia corylea. 



Fig. 31. — Young ascus with two nuclei; central bodies facing each other. 



Pig. 32. — Slightly older ascus ; chromatin strands more conspicuous. 



Fig. 33. — ^Just before nuclear fusion in ascus. Lower nucleus lies above and 

 partially overlapping the other. 



Fig. 34. — ^Section of ascus with slice of one nucleus showing three chromatin 

 strands and sections of others. 



Fig. 35. — Early stage in fusion of nuclei; central body of upper nucleus has 

 pushed ahead on the membrane of the lower nucleus, its chromatin system drawn 

 out in long cone. 



Fig. 36. — ^Stage of fusion. Central bodies and chromatin of two nuclei side by 

 side, but independent; nucleoli already combined in one. 



Pig. 37. — ^Chromatin systems overlapping, but distinct. Nucleoli in contact. 



Pig. 38. — iStage just before the central bodies combine; nucleoli in this case 

 still separate. 



Pig. 39.— The central bodies are joined side by side. Chromatin systems com- 

 bining. 



Pig. 40. — Central bodies and chramatin systems completely combined. Nucleoli 

 still separate. 



Pig. 41. — Shows entire ascus ; stage about the same as in fig. 40. 



Fig. 42. — Fusion of nuclei complete. 



