184 



A MANUAL OF THE ASPERGILLI 



Aspergillus sydowi (Bain, and Sart.) Thom and Church, The Aspergilli, 



p. 147. 1926. 



Synonym: S. sydowi Bainier and Sartory, in Ann. Mycol. 11: 25-29, PI. 

 Ill, 1913. Compare PI. IV, cultures No. 4235.17 and K22, 

 Thom and Church, The Aspergilli. 192(5. 



Colonies upon Czapek's solution agar growing well at room temperature, 

 in most strains close-textured and velvety from crowded conidiophores and 

 heads arising from the substratum (fig. 53 A), in other strains more or less 





Fig. 52. Conidial structures in Aspergillus sydowi, NRRL No. 250, X 800. A, 

 Typical, large conidial head borne upon an erect conidiophore arising from the 

 substratum. B, Small head, borne as a lateral branch on an aerial hypha, consisting 

 of a small cluster of double sterigmata. C, Minute heads in which sterigmata appear 

 in a single series only. 



floccose (fig. 53 B) from interlacing and trailing aerial hyphae bearing con- 

 idial heads ranging from large, well-formed structures to minute fruits 

 consisting of clusters of simple sterigmata bearing few conidial chains, blue- 

 green in color, approximately Delft blue or deep Delft blue (Ridgway, PI. 

 XLII) with the blue effect especially marked in young fruiting areas (PL 

 V A), reverse usually in shades of red, from coral red to maroon (Ridgway, 



