276 A MANUAL OF THE ASPERGILLI 



low globose heads. Sclerotia were not reported. In our experience, how- 

 ever, they are seen not infrequently in cultures which otherwise fit the 

 description of A. sulphureus as presented. In the sub-series, represented 

 by A. quercinus (Bainier, Thom and Church), sclerotia are very abundant 

 and heads comparatively few and scattered among the sclerotia. In addi- 

 tion to these two names which roughly designate sections or series of 

 isolates as we find them, every gradation between these extremes may be 

 anticipated. 



The species is fairly common in soils, on cereal grains, and upon decaying 

 vegetation. 



Several species have been described as having conidial heads sulphur 

 yellow but doubtfully separable from A. sulphureus. 



S. ochroleuca Spegazzini, in Myc. Argent V, p. 434, in Anal. Mus. Nac. Buenos 

 Aires, Ser. 3, T. 13. 1911. 



S. auricoma Gueguen, in Bui. Soc. Myc. France 16: 171-187, figs. 1-48. 1899. This 

 appears to have been a member of the series with primary sterigmata proliferating 

 abundantly to form little conidiophores and secondary heads thus giving the head the 

 appearance of bearing yellow hair. Such proliferation occasionally occurs in many 

 species but has not again been found in this group. 



S. vitelline, Ridley, in Jour. Bot. (London) 34: 152, pi. 257, figs. 14-16. 1896, is 

 described as producing bundles or coremia composed of partially adherent conidio- 

 phores. The organism does not appear to have been cultivated and has not since 

 been reported. 



Aspergillus quercinus (Bainier) Thom and Church, in The Aspergilli, p. 186, 



1926. 



Synonym: S. quercina Bainier, in Bull. Soc. Bot. France 28: 78. 1881. 

 See also Sartory, Etude biologique du Sterigmatocystis 

 quercina Bainier, in Bui. Soc. Myc. France 26: 349. 1910. 



Colonies upon Czapek's solution agar spreading broadly, characterized 

 by the presence of an aerial white mycelium and the abundant production 

 of sclerotia over the whole area (PI. VII, E and fig. 74 A), or in sectors, or 

 variously distributed ; the mass changing from yellow to orange-yellow and 

 finally to rufous or brick red shades with the ripening of the sclerotia; re- 

 verse in shades of yellowish-orange. Conidial heads in yellow tints, near 

 sulphureus, scattered among the sclerotia or occurring in long-stalked 

 groups in the dryer areas of the culture tube or plate, mostly up to 200> 

 in diameter, but occasionally larger, up to 300 or even 400/x (fig. 74 C). 

 Conidiophores with walls mostly pale yellow, especially in the outer layer, 

 pitted (fig. 74 D), occasionally with abundant granules, about 2/jl in thick- 

 ness, varying from short and inconspicuous in crowded sclerotial areas to 

 very long tufts in dryer areas, up to 2 or even several millimeters by 10 to 

 20m- Vesicles colorless, crushing easily, 35 to 45^ in diameter, fertile over 



