598 



A MANUAL OF THE PENICILLIA 



Colonies on corn meal agar spreading broadly, thin, with mycelium 

 largely submerged, producing scattered conidial structures and typical peri- 

 thecia throughout the entire colony but more abundantly in colony mar- 

 gins, httle pigment produced. 



Fig. 154. Penicilliuin avcllaneum Thom and Turesson. A and B, Two-week-old 

 colonies of NRRL 2108 on Czapek and malt agars; perithecia are rather sparsely pro- 

 duced and are usually most evident along intersecting colony margins. C, Perithecia 

 as seen with low magnification, X 5. D, Ripe ascospores showing typical elliptical 

 form and thick, pitted walls, X 1500. 



The pattern of the perithecial initials has not been established definitely, 

 since ascosporic structures usually develop well ^\•ithin the margins of es- 

 tablished colonies. 



Species description centered upon NRRL 1938 isolated in September 

 1943 from soil from San Antonio, Texas; and NRRL 2108, received in 



