i 



368 



A MANUAL OF THE PENICILLIA 



B 



Fig. 97. Penicillium notatum Westling. .4 and B, Two-week old colonies of NRRL 

 821 (type) on Czapek and malt agars. C, NRRL 824, The Fleming isolate, on Czapek. 

 D, NRRL 1249. B21, a substrain of the Fleming culture that produces unusually high 

 yields of penicillin in surface culture. E, NRRL 832, the strain first used for produc- 

 ing penicillin in submerged culture. F, NRRL 1950, a strain producing good yields 

 in either surface or submerged culture, 



