PLATE 37. 



Xylarieae. 



Fig. 1. Hypoxylon perforatum, (Schw.), natural size, on dead oak 

 limb. 



" 2. Same magnified. 



" 3. A smaller portion containing two perithecia highly mag- 

 nified. 



" 4. A cluster of asci in different stages of growth. 



" 5. A single mature ascus. 



" 6. Five sporidia. 



" 7. Hypoxylon marginatum, (Schw.), natural size, on dead oak 

 bark. 



" 8. Vertical section of part of a stroma considerably magni- 

 fied. 



" 9. A cluster of asci, one of which is mature. 



" 10. Three sporidia. 



Note. Figures on this plate not drawn to any definite scale. 



