PLATE 13. 



Hypocreaceae. 



Fig. 1. (iibberella pulicaris, Fr., natural size, on dead corn stalk. 

 2. A group of perithecia somewhat enlarged. 



" 3. Three perithecia highly magnified. (A.) an entire peri- 

 thecium. (B.) a broken down and empty one. (C.) a 

 vertical section of a perithecium showing asci. 



" 4. A group of asci in various stages of development. 



5. Four mature sporidia. 



" 6. Three sporidia germinating. 



" 7. Calonectria Canadensis, E. & E., natural size on dead elm. 



" 8. Cluster of perithecia around the base of the conidial 

 stroma. 



9. Vertical section of perithecium. 



" 10. Two mature asci. 



" 11. Three mature sporidia. 



" 12. Young perithecia around the base of the conidia-bearing 

 stroma, the central head cut vertically showing the 

 superficial conidial layer. 



" 13. Basidia and conidia enlarged. 



" 14. Two conidia enlarged. 

 Note. — Fi.gures on this plate not drawn to a definite scale. 



