320 



A MANUAL OF THE PENICILLIA 



Fig. 87. Penicillium nigricans (Bainier) Thom. Ai-A^, Habit sketches of repre- 

 sentative penicilli illustrating strongly divaricate pattern. By-Bi, Penicilli as seen 

 under oil immersion. C, Mature conidia, conspicuously echinulate. 



lating a monoverticillate head (figs. 87B and 88D); sterigmata usually 

 borne in clusters of 6 to 12, more or less divergent, about 7 to 8m by 2.0/i; 

 conidia 3.0 to 3.5/x in diameter, globose, echinulate or spiny (fig. 87C), 

 appearing olive brown under high power. 



