BIVERTICILLATA-SYMMETRICA 



581 



measuring about 7.0 to 8.0m by 2.0 to 2.5ju, tapering to conspicuous con- 

 idium-bearing tips; conidia elliptical with ends often someSvhat pointed, 

 smooth-walled, about 2.5 to 3.0^ by 2.0 to 2.5/x, in occasional strains slightly 

 larger or smaller; perithecia produced irregularly (see malt agar). 



Fig. 148. I'cnicilliuin vcnnicidatum Dangeard. A ami /.', 'l\'ii-day-old colonies on 

 Czapek and malt agars. C, Detail of a typical penicillus, X 1000. D,Mature asco- 

 spores, showing characteristic elliptical form and conspicuously echiuulate walls, 

 X 1500. 



Colonies on malt agar (Col. PI. IX), spreading broadly, up to 7.0 cm. 

 in 10 to 12 days (fig. 148B), yellow to yellow-orange throughout (R., PL IV) 

 in most strains from abundant perithecia and enveloping pigmented my- 

 ceha, in some strains showing reddish colors in age and in others developing 

 abundant conidial heads in marginal to submarginal zones 1 to 2 cm. wide, 

 in dull yellow-green shades near tea green (R., PI. XLVII), conidial struc- 

 tures as described above except conidiophores up to 500^ in length and 



