MONOVERTICILLATA 



161 



tially conidial presenting a velvety appearance, through more or less floc- 

 cose from the development of abundant vegetative mycelium, to predomi- 

 nantly sclerotial with limited development of fruiting structures or of aerial 



Fig. 45. Penicillinm sclerotiorum v. Beyma, NRRL 2074. A and B, Two-week-old 

 colonies on Czapek and malt agars; the former is characterized by a heavy and con- 

 sistent development of sclerotia, the latter by alternating conid'al areas ( ight) and 

 massed sclerotia (dark). C, C'olonv margin showing massed clusters, or "nests," 

 of sclerotia, X 5. I), Detail of penicilli, X 900. 



vegetative hyphae (fig. 45A), frequently showing these different aspects as 

 sectors in the same colony ; conidial structures limited or abundant, at first 

 arising primarily from the substratum and en masse producing areas near 

 artemisia green (Ridgway, PI. XLVII), in age often developing from aerial 



