

Fig. 160. A and B, Penicillium islandicum Sopp, XRRL 1038, ten-day-old colonies 

 on Czapek and malt agars. C, P. verruculosum Peyronel, NRRL 1050, on malt agar 

 at ten days. D, E, and F, P. varians Smith, NRRL 2096. D, Colonies on malt agar 

 at ten days. E, Penicillus showing characteristic biverticillate and symmetrical 

 pattern, X 1000. F, Detail of conidiophores showing heavy, dark (greenish) walls 

 originating from hyphal elements which often simulate the foot-cells of Asverqillus, 

 X 1000. 



622 



