246 A MANUAL OF THE ASPERGILLI 



blister beetle (Macrobasis albida), NRRL Xo. 316 (Thorn No. 4660) 

 isolated from onion bulbs, and others with characteristic heads and scle- 

 rotia have been obtained from garlic bulbs, from cactus plants, and from 

 soils, particularly from the general region of Texas, Arizona, and Mexico. 

 Strains have also been isolated from soils collected near Calcutta. 



The large, globose, pale yellow to ochraceous heads of the species strongly 

 suggest relationship to the A. oehraceus group. The smooth-walled co- 

 nidiophores and black sclerotia, however, more closely ally it with Asper- 

 gillus wentii and the other species grouped with it. It may, however 

 represent a form somewhat transitional between the great groups repre- 

 sented by A. niger on the one hand and A. oehraceus on the other. 



Aspergillus avenaceus Geo. Smith, in Brit. Mycol. Soc. Trans. 25: 24-27, 



PL 1, figs. 1-3. 1943. 



Colonies on Czapek's solution agar (with sucrose) at room temperature 

 spreading rapidly, more or less conspicuously zonate (fig. 65 D), slightly 

 fioccose, white at first, then dull yellow to ecru-olive (Ridgway, PL XXX) 

 as shown in PL VI E, with, at times, a greenish tinge without becoming 

 truly green; reverse pale dirty pink. Conidial heads large, globose 400 

 to 600m in diameter, or up to 1,000m, splitting into columnar masses of 

 conidial chains. Conidiophores up to 5 mm. long, 18 to 30m in diameter, 

 with walls 2.5 to 4m thick, smooth in fluid mounts; but appearing finely 

 roughened when examined dry. Vesicles globose or slightly flattened, 

 thick-walled, up to 185m in long axis, sterigmata in two series, primary 22 

 to 50m by 6m, secondary 11 to 13m by 4m (fig. 65 F). Conidia ellipsoid, 

 smooth, 4 to 6 or 6.5m by 3.2 to 4m- Sclerotia dark grayish-brown to 

 black (fig. 65 E), elongate, irregularly flask-shaped, sometimes with the 

 "neck" forked, apical portion white to gray during development, 2 to 3 mm. 

 in long axis, scattered in concentric zones after 7 to 10 days. 



On Czapek agar with glucose, sclerotia are more abundant and larger. 

 On wort, or potato agar, conidial heads are abundantly produced but 

 sclerotia are delayed for several weeks and are few in number. 



Species characterization adapted from George Smith's description. 



This very distinctive species (NRRL 517: Thom 5725) is represented by 

 a single isolation from seed peas made in 1938 by Dr. G. E. Turfitt of the 

 London School of Hygiene and Tropical Medicine, University of London. 



Aspergillus wentii Wehmer, in Centralbl. f. Bakt. etc., 2 Abt., 2, p. 150. 

 1896. See also The Aspergilli, Thom and Church, p. 183. 1926. 



Colonies on Czapek's solution agar, rapidly growing and broadly spread- 

 ing, fioccose with white or yellowish aerial hyphae which in some strains 

 pile up in the plate (PL VI F, and fig. 67 A) or fill the test tubes for several 



