590 



A MANUAL OF THE PENICILLIA 



4.5 to 5.0 cm. in two weeks, thin, white, with vegetative mycelium largely 

 submerged but evident as a loose aerial network ranging from cream to 

 golden yellow in color; producing abundant perithecia mostly adjacent to 

 the agar surface and usually forming a continuous layer, but sometimes less 

 abundant or lacking in limited sectors; perithecia spherical to oblong (fig. 



Fig. 151. I'l ninllium spiculisponun Lehman. A and B, Ten-daj'-old colonies of 

 NR.RL 1028 on Czapek and malt agars. C, Perithecia as seen on steep agar, X 30. 

 D, Mature ascospores and asci, X 1500. 



151 C), variable in size up to 350 to 400/x in diameter, white to dull cream 

 in color often becoming yellow in age, characterized by a fairly definite 

 wall of closely interwoven hyphae, surrounded by a loose mantle of heavy, 

 encrusted radiating hyphae to produce a bristly appearance under low 

 magnifications ; perithecium containing a hyphal network bearing abundant 

 asci in short chains; asci oval to sub-spherical when mature, about 6.0 to 



