Chapter XIX 

 THE ASPERGILLUS TAMARII CxROUP 



Outstanding Characters 



Conidial heads radiate, generally loose-textured, hemispherical to globose, 

 yellow-brown to olive-brown in color with green shades entirely lacking 

 or only transiently produced in early stages. 



Conidiophores colorless, typically roughened throughout a part or all 

 of their length. 



Vesicles subglobose to globose, fertile over the upper half to the entire 

 surface. 



Sterigmata in one or two series depending upon the species and strain, 

 often showing both conditions within the same head. 



Conidia heavy-walled, rough, elliptical, pyriform or subglobose, de- 

 pending upon the species. 



Sclerotia commonly present, purple to reddish-purple or black, white- 

 tipped when young. 



The Aspergillus tamarii group represents a collection of more or less 

 closely related forms that are believed to be intermediate between the 

 A. wentii and A. flavus-oryzae groups. Relationship to the latter group 

 is unquestionable since there are intergrading forms which almost com- 

 pletely bridge the gap from one group to the other. The group embraces 

 two principal series: one, typified by A. terrieola, is characterized by dull 

 yellow-brown conidial heads which never show any trace of green; the 

 other, typified by A. tamarii, possesses dark brown conidial heads which 

 commonly show transient shades of olive-green during the period of rapid 

 growth. 



Group Key 

 I. Conidia strongly elliptical, lemon-shaped A. citrisporus von Hohnel 



II. Conidia not strongly elliptical. 



A. Conidial heads light yellow-brown when mature, showing no green color at 

 any stage. 



1. Colonies predominantly floccose, conidia with prominent projecting 



tubercles A. lulcscens Bainier 



2. Colonies not predominantly floccose. 



a. Heads large, conidia coarsely roughened with flattened bars and 



tubercles A. terrieola Marchal 



b. Heads small, conidia finely roughed 



A. terrieola var. americana Marchal 



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