278 



A MANUAL OF THE PENICILLIA 



(now maintained as NRRL 2026), received from the Centraalbureau in 

 May 1946, colonies on Czapek's solution and malt extract agar (approx- 

 imates wort) differ substantially. 



On Czapek the colonies are somewhat radially furrowed, close-textured 

 (fig. 74A) and consist of a tough basal felt in which are embedded abundant 

 small irregular, yellow to light brown sclerotia mostly lOO/x or less (fig. 



Fig. 74. Penicillium pulriUorum TuiHtt. .4 and B, Two-week-old colonies of 

 NRRL 2081 on Czapek and malt agars. C, Scattered sclerotia of NRRL 2082, X 40. 

 D, Detail of penicilli in same strain, X 1000. 



74C), and with colony surface characterized by a thin, more or less floc- 

 cose overgrowth from which scattered to fairly abundant divaricate conid- 

 ial structures develop, with large structures arising from the substratum 

 directly; conidiophores conspicuously rough, up to 400 to 500^ in length 

 by 3.0 to 3.5m in diameter; penicilli as described by Turfitt (fig. 74D). 

 Colonies on steep agar essentially as on Czapek but growing more 



