26 



A MANUAL OF THE ASPERGILLI 



or it may not be determinable on the ripe conidium by ordinary examination. 

 In the sense of the definition above, no endogenous conidia appear in 

 Aspergillus. In cases, the primary walls are seen to break away if ripe 

 spores are mounted in fluid, often carrying with them the granular materials 

 which impart the characteristic marking to the spore, hence leaving the 

 wall of an .A. nigcr spore smooth (A. luteo-niger Lutz). 



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Fig. 7. The development and relationship of Aspergillus glaucus and Eurotium, 



after DeBary, 1854. 



Perilhecia 



The general morphology of the perithecium of the A. glaucus group 

 (Eurotium) was described and figured by DeBary (1854, 1870), while 

 that of A. nidulans was described by Eidam soon thereafter (1883). 

 DeBary described the yellow to orange or ferrugineous perithecia as from 

 90 to 300 m in diameter, without ostiole and without specialized appendages 

 (fig. 7). These perithecia are borne, above the surface of the substratum 



