THE ASPERGILLUS GLAUCUS GROUP 



139 



by 10 to 20 even 25m in diameter, straight or twisted. Conidiophores 

 mostly arise as very short branches of aerial hyphae up to 20 to 30/z long or 

 less commonly up to 100 to 125m even up to 250m and gradually broadening 

 toward the apex to a vesicular area which is very flat, dome-like, almost the 

 effect of a truncated cone, 8, 10 to 20m or more in diameter, bearing a single 

 series of sterigmata, 6, 8, 10 by 2 to 3m, or in particular strains growing out 

 into little conidiophores producing secondary heads ; conidia at first barrel 

 form then subglobose about 3m in long axis in Bainier's strain, progressively 

 larger in related strains. No perithecia found. 



The type culture has not been seen. Forms with approximately the 

 morphology described, however, have appeared in strains NRRL No. 145 

 (Thorn 4246) from moldy corn; Thorn 4197.3 (culture lost) from Owen in 



Fig. 36. A, Aspergillus gracilis, NRRL No. 145, on Czapek's solution agar with 

 20 percent sucrose, after incubation for 2 weeks at room temperature. B, A. 

 restrictus, NRRL No. 154, on Czapek's solution agar with 20 percent sucrose after 

 18 days at room temperature. 



the sugar laboratory, New Orleans; and a strain from Thaxter appearing as 

 a contaminant in a Papulaspora culture. A. gracilis may thus be assumed 

 to represent a form occasionally found especially in very concentrated 

 substrata. Biourge later contributed a culture, as type, of A. hypo- 

 janthinus originally described by him as Penicillium hypojanthinum Biourge 

 (1923). Three other cultures from Biourge labeled P. (Microaspergillus) 

 hickeyi, Microaspergillus albo-marginatus, and P. (M.) guegueni (figured in 

 his monograph, Plate XX, but not described) appear in culture to be only 

 minor variations of this general form. Later, Biourge sent his undescribed 

 A . sartoryi. This grew more freely and showed the conidiophore and vesicle 

 of A. gracilis; conidia were 6 to 7m or greater in long axis, definitely rough 

 and corresponded almost exactly with a culture received from George Smith 



