ASYMMETRICA-VELUTINA 



343 



green (R., PI. XLVII) no exudate produced; reverse in light bro^\Ti to dark 

 shades approaching black in localized sectors; penicUli as on steep agar. 



Typically the metulae comprising a single penicillus tend to diverge, 

 giving the impression of a group of two or three (very rarely more) mono- 

 verticillate structures. The metulae may or may not be of equal length, 



x\\ 



V\\f/, 



'/{'. 



B 



m/4 



Fig. 91. Penicillium corylophilum Dierckx, NRRL 8U2. A, JJ, and C, T\vu-\veek- 

 old colonies on Czapek, steep, and malt agars; note particularly the somewhat angu- 

 lar colony pattern on steep agar and the broadly spreading growth on malt agar. 

 D, Detail of a single penicillus in another typical strain, NRRL 793; X 750. 



further contributing to this general aspect. Individual spore chains 

 sometimes adhere in loose columns, but these are poorly formed at best 

 and are not produced with any degree of regularity comparable to Peni- 

 dllium dtrinum (fig. 90) and P. steckii. The spore chains arising from a 

 single cluster of sterigmata usually show no definite arrangement and in 



