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A MANUAL OF THE PENICILLIA 



but developing abundant inconspicuous perithecia (see malt agar) after 

 one week to 10 days and showing bright golden-yellow shades from pig- 

 mentation of the perithecia and the encrusted hyphae surrounding them; 

 penicilli generally lacking or, if present, limited in number and usually frag- 

 mentary (see 20 per cent sucrose-Czapek), not affecting the colony appear- 



FiG. 152. I'enicilliuin roiuitduin Raper and Feuiiell, NRRL 2107. A and B, Ten- 

 day-old colonies on Czapek andinalt agars. C, Mature perithecia on malt agar, 

 X 30. D, Ripe ascospores showing characteristic globose form and conspicuously- 

 roughened walls, X 1500. 



ance; exudate limited, light amber in color; odor slight or lacking; reverse 

 in yellow to orange-red shades with surrounding agar lightly colored. 



Colonies on Czapek's solution agar with 20 per cent sucrose growing 

 restrictedly as above, plane, producing abundant conidial structures in a 

 dense stand, velvety or nearly so, in pale gray-green shades near olive-gray 

 (Ridgway, PI. LI) to storm gray (R., PI. LII), conidiophores arising pri- 



