PLATE 13. 



Hypocreaceae. 



Fig. 1. (jibberella 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. Figures on this plate not drawn to a definite scale. 



