BIVERTICILLATA-SYMMETRICA 



601 



surrounded by limited to fairly extensive envelopes of irregularly twisted 

 or coiled, bright j^ellow, encrusted mycelium (fig. 155C); asci abundantly 

 produced throughout the body of the perithecium, apparently borne in 

 clusters as buds from fertile hyphae {fide Emmons), sub-spherical to 

 elongate when mature, 10 to 12m in long axis, 8-spored; ascospores elliptical, 



Fig. 155. Penicillium luteum Zukal. A and B, Two-week-old colonies of NRRL 

 1010 on Czapek and malt agars. C, Scattered, small perithecia of NRRL 2102 on corn 

 meal agar, X 25. D, Ripe ascospores showing the characteristic banding described 

 by Zukal, X 1500. 



about 4.2 to 4.8iu by 2.2 to 2.8/i with conspicuous spiral bands that appear 

 transverse as originally described by Zukal (fig. 155D), shghtly yellow. 



Colonies on corn meal agar up to 3.0 to 3.5 cm. in 2 weeks, growing 

 sparsely \\ath vegetative mycelium largely submerged, producing perithecia 

 in limited numbers and only in central colony areas, in form, dimensions, 

 and structures as described above ; conidial structures lacking or limited in 



