98 EXPLANATION OF FIGURES IN PLATES. 



Plate IV. — Phyllactinia corylea. 



Fig. 43. — Early stage in synapsis. 



Fig. 44. — Synapsis ; ends of chromatin strands protruding from contracted mass. 

 Fig. 45. — Late synapsis stage stained to specially differentiate the central body. 

 Fig. 46. — Loosening up of chromatin after synapsis. 

 Fig. 47. — Early spirem stage. 



Fig. 48. — Culmination of spirem stage; eight distinct chromatin strands corre- 

 sponding to eight chromosomes of later stages. 

 Fig. 49. — Same stage; strands spreading from center without forming cone. 

 Fig. so. — Young penicillate cell. Three nuclei showing central bodies. 

 Fig. si. — ^Full-grown penicillate cell. 



Fig. 52. — Transverse section of ascus, showing prophase in formation of spindle. 

 Fig. S3. — Primary nucleus of ascus ; equatorial-plate stage, eight chromosomes. 



