ASYMMETRICA-DIVARICATA 



317 



wide, or upon short branches from aerial hyphae, with walls conspicuously 

 roughened, consisting of variously arranged, divergent structures, 1, 2, 

 3-verticiIlate (fig. 84B), with ultimate branchlets (metulae) usually about 

 10 to 20m by 2.5 to 3.0m, bearing sterigmata in clusters of 4 to 10 and meas- 

 uring 7 to 9m by 2.0 to 2.om, with definite conidium-bearing tips narrow but 



Fig. 84. Penicillium canescens Sopp. A1-A3, Habit sketches of representative 

 penicilli showing tendency of conidial chains to form columns. B1-B3, Penicilli 

 showing diversity of pattern and details of cellular structures. 



comparatively short (fig. 84B); conidial chains arising from separate 

 metulae tending to adhere into loose columns in young cultures, but be- 

 coming more or less divergent in age; conidia at first ovate to subglobose 

 becoming globose at maturity with walls roughened mostly 2.0 to 2.5m 

 in diameter, occasionally larger. 



