PLATE 16. 



Cbaetomieae. 



Fig. 1. Chaetomium pusilluni, E. & B. natural size on hickory 

 hoop of a barrel in a cellar. 



2; A small group somewhat enlarged. 



3. A single perithecium. 



4. An ascus. 



5. Three sporidia. 



6. Several of the peculiarly branching hairs of the mycelium 

 surrounding the perithecia. 



