MONOVERTICILLATA 



191 



the basal felt, smooth-walled, commonly 500 to 800m or more in length, 

 sometimes branched but bearing strictly monoverticillate penicilli averag- 

 ing slightl}' larger than on Czapek; conidia more commonly remain ellip- 

 tical at maturity, otherwise, as described above. 



Fig. 52. Penicillium lividum Westling, NRRL 754. .4 and B, Two-week-old col- 

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

 characteristic long conidiophores, X 40. D, Detail of penicilli, X 900. 



Colonies on malt agar growing rapidly, up to 5.0 to G.O cm. in 10 to 12 

 days, not furrowed, very loose textured, deeply velvety to lanose, 2 to 3 

 mm. deep, heavily sporing in colony centers, thinning outward, with 

 denser conidial areas ranging from dark glaucous gray to grayish blue- 

 green (R., PI. XL VIII) to deep grayish blue-green in age; no odor or exu- 

 date; reverse in orange shades; conidiophores originating as above but 

 commonly up to 1 mm. or more in length and with walls often finely 



