ASYMMETRICA-VELUTINA 



397 



to 12.0m by 3.0 to 3.5m; conidia globose or subglobose, commonl}^ ranging 

 from 3.5 to 5.0m, not infrequently larger up to 7.0 or 8.0m, smooth-walled, 

 dark green in mass. 



Colonies on steep agar essentially duplicating those upon Czapek in color, 

 cultural characteristics, and details of morphology, but growing somewhat 

 more rapidly; penicilli as described above. 



B C 



Fig. 105. Penicillium roqueforti Thorn. A, Piece of Roquefort cheese showing 

 characteristic marbling (dark green) due to growth of the mold in channels through- 

 out the cheese. (After Thorn, in Jour. X. Y. Bot. Garden 45, 1944.) B and C, Ten- 

 day old colonies of NRRL 849 (type) on Czapek and malt agars. 



Colonies upon malt extract agar growing more rapidly than on Czapek, 

 attaining a diameter of 8.0 to 10.0 cm. in 8 to 10 days (fig. 105C), but other- 

 wise similar in basic character and coloration; reverse becoming blackened 

 in age; conidiophores and metulae usually exliibiting increased roughness 

 and conidia tending to form longer and more compact columns up to 200 

 or 300m in length. 



Species description is based upon Thom's type, his No. 18 (NRRL 849), 



