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Fig. 54. Aspergillus janus; NRRL No. 1787. A and B, Colonies on Czapek's 

 solution agar and malt agar, respectively, showing a, scattered white conidial heads, 

 b, crowded green heads, and c, massed niille cells, two weeks old, incubation at 2-1° 



C, X i. C, Characteristic white heads borne on long thin conidiophores, X 7.5. 



D, Massed green heads in dense stand adjacent to the substratum, with white heads 

 projecting from the left, and with localized development of hulle cells in two limited 

 areas at right, X 7.5. E, Heads of mixed character with older (outer) conidia white 

 and younger (inner) conidia green, X 24. F, Hulle cells, X 350. G, Typical white 

 head showing clavate vesicle, double sterigmata and small, smooth conidia, X 450. 

 H, Head of mixed character, at this stage (early) producing small white, smooth 

 conidia, X 450. /, Typical green head, showing small, nearly globose vesicle, double 

 sterigmata and larger, echinulate, green conidia, X 450. (Reprinted from Raper 

 and Thorn, "New Species of Aspergilli from Soil," Mycologia 36: Nov -Dec. 1944.) 



188 



