MONOVERTICILLATA 



193 



ing throughout in Hght bkie-green shades near pea green to celandine green 

 (Ridgway, PI. XLMI), remaining approximately unchanged in age; 

 exudate lacking; odor slight, somewhat peculiar, but not distinctive; 

 reverse at first in cream to dull yellow shades changing to quaker-drab 

 in age; conidiophores abundantly produced, arising primarily from sub- 



FiG. 53. A-C, Penicillium aurantio-violaceum Biourge, XRRL 760. .4, Two-week- 

 old colony on Czapek agar. 5, Low-power view of colony margin showing long conid- 

 iophores, X -10. C, Detail of penicillus, X 900. D and E, P. trzebinskii Zaleski, 

 XRRL 731, growing upon Czapek and steep agars. 



merged hyphae or from the basal felt, long, ascending, becoming somewhat 

 tangled, up to 400/i or more in length by 2.5 to 3.5m (fig- 53B), occasion- 

 ally branched, walls closely and finely echinulate, apices somewhat en- 

 larged up to 4.5 to 5.0/x; penicilli strictly monoverticillate and consisting of 

 closely crowded verticils of 8 to 12 or more sterigmata mth tips somewhat 

 divergent, bearing parallel or divergent conidial chains up to 100m or 



