MONOVERTICILLATA 



173 



limited trailing hyphae, heavily sporing. usually celandine to artemisia 

 green (Ridgway, PI. XLVII) becoming storm gray (R., PI. LII) in age, in 

 some strains darker, approximating American to dark American green 

 (R., PI. XLI); exudate limited, clear to light amber; odor faint, moldy; re- 



FiG. 49. Pcnicilliumfrequentans Westling, NRRL 1915. A and B, Two-week-old 

 colonies on Czapek and steep agars. C, Low-power view of colony margin showing 

 columnar character of conidial masses, X 40. D, Detail of penicilli, X 900. 



verse mostly in shades of yellow-orange near russet to mars brown (R., 

 PI. XV), but in occasional strains appearing light purplish brown; conidio- 

 phores short, up to 100 to 200m in length by 3.0 to 3.5m in diameter, with 

 walls smooth or finely roughened, and apices enlarged up to 5.0m or more 

 in width; conidial structures forming a crowded, fairly continuous layer 

 over the whole culture (fig. 49C), with penicilli almost entirely monoverti- 



