PLATE 13. 



Hypocreaceae. 



Fig. 1. Gibberella 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. Caloneetria Canadensis, E. & E., natural size on dead elm. 



8. Cluster of perithecia around the base of the conidial 



strom a. 



. 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. 



