MONOVERTICILLATA 



151 



Fig. 42. Penicillium levitum Raper and Fennell. Ai-At,, Diminutive and appar- 

 ently fragmentary penicilli characteristic of this species. B, Perithecium partially 

 crushed indicating the manner in which asci and ascospores are expelled. C, Asci 

 borne terminally upon short branches from fertile hyphae. 



