SAC FUNGI CONTINUED 



149 



for producing oxalic acid. Il has' stiff slender conidiophores several 

 millimeters in height. The terminal part can be studied only after 

 the bleaching or removal of the dark masses of conidiophores. 



Fig. 51. — Stcrigmatocystis niger ^Aspergillus niger) showing conidiophores and coni- 

 diospore formation with stages in germination of spores. (After Henri Coupin.) 



The genus Thidavia is represented by a common pathogenic species, 

 T. basicola, whose life history and pathogenic character will be de- 



