ASYMMETRICA-FASCICULATA 



513 



tangled chains of spores 150 to 200jLi in length (fig. 129A); penicilli asym- 

 metric, commonly once or twice branched, with branches mostly 15 to 25ju 

 by 2.5 to 3.5/x, occasionally up to oO/x in length, typically appressed against 

 the main axis with metulae arising from both at about the same level (fig. 



B 



C ___ ^ 



Fig. 131. Penicillium expansuw series. A and B, P. expansum Link, NRRL 973, 

 on Czapek and malt agars at 10 days. C and D, P. crustosum Thorn, NRRL 1983, 

 as the preceding. 



129B); metulae usually borne in verticils of 3 to 6 and measuring about 

 10 to 15/i by 2.2 to 3.0^; sterigmata in groups of 5 to 8 or 9 and usually 

 ranging from 8 to 12^ by 2.0 to 2.5ju, occasionally up to 15 to 16/x by 3.0/x; 

 conidia elliptical when first formed and usually continuing to show some 

 ellipticity (fig. 129C), measuring mostly about 3.0 to 3.5m in diameter, in 

 some strains becoming almost globose at maturity with walls smooth, 

 appearing dull j'ellow-green in mass. 



Colonies on steep agar growing more rapidl}- than on Czapek, attaining 



