BIVERTICILLATA -SYMMETRICA 



027 



ducing large, compact, bi\'erticillately symmetrical poniciili (see his fig. 3, 

 PI. IV). Such structures are occasionally observed in our cultures but 

 represent the exception rather than the rule. It is possible that the cul- 



FiG. 161. Penicillium piceum Raper and Fennell. A and B, Ten-day-old colonies 

 of NRRL 1071 on Czapek and malt agars. C, Conidial heads as seen under low power 

 presenting the spruce-tree-like pattern that is characteristic of this species, and from 

 which the name was taken, X 115. D, Penicillus showing typically crowded metulae 

 and sterigmata, X 1000. 



ture is undergoing progressive degeneration similar to that reported for 

 the type of P. purpurogenum var. ruhri-sderotium Thom (see p. 637). 



Penicillium piceum Raper and Fennell, in Mycologia, 40 : 

 533-535, fig. 9. 1948. 



Colonies on Czapek 's solution agar growing somewhat restrictedly (fig. 

 161A), attaining a diameter of 3.0 to 3.5 cm. in 12 to 14 days at room tem- 

 perature, consisting primarily of a thin, white to yellow mycehal felt tear- 



