THE ASPERGILLUS NIDULANS GROUP 



161 



to 4A/J. by 3.6 to 3.8ju, and with 2 pleated equatorial crests with sinuate and 

 entire margins about 0.5 to 0.6m in width. 



A : A. nidulans 



B : A. unguis 



immBm 



O A. nidulons vor. lotus 



D : A. quodrilmeotus 



IS&&>»S8J&&_ su k s&sg^^Ssfc^sisi&s 



E ■' A. rugulosus 



F : A. voriecolor 



Fig. 42. Diagrammatic representations of cross sections of colonies of different 

 species of the Aspergillus nidulans group showing the relative abundance of conidial 

 heads and perithecia and the manner in which these structures are borne : con, conidial 

 heads; d.h., mantle of divergent hyphae; hul, huile cells; my, mycelial felt; per, 

 perithecia; ps, pseudostalk of hiille cells and sterile hyphae; st, long, thick walled, 

 sterile hyphae; sub, substratum; and un, unstalked perithecium. Scale approxi- 

 mate. (Reprinted from Thom and Raper, "The Aspergillus nidulans Group," 

 Mycologia 31: 653-669. 1939.) 



Cultures studied included Type NRRL No. 206 (Thom No. 4138.T11) 

 from New Jersey soil, as discussed by Thom and Church in The Aspergilli, 

 p. 138, and also isolates from Washington, D. C, Texas, Nebraska, and 

 California. Very common in soil. 



