THE ASPERGILLUS TAMARII GROUP 251 



B. Conidial heads dull dark brown when mature. 



1. Green shades commonly evident, but confined to early stages 



A. tamarii Kita 



2. Green color persisting for several days, but eventually disappearing 



Bronze series 



Aspergillus citrisporus von Hohnel, in Sitzungsber. K. Akad. Wiss. Wien, 



Math. -Naturw. Kl. Ill, I Abt., p. 987, 1902. See The 



Aspergilli, Thorn and Church, pp. 191-2. 1926. 



Colonies on Czapek's solution agar, at room temperature, spreading 

 fairly rapidly as submerged mycelium, producing a sparse aerial growth 

 of conidiophores only; conidial areas at first yellow then gold and finally 

 orange-brown (fulvus of Saccardo's Chromotaxia, approximately Mikado 

 brown of Ridgway); reverse colorless. Conidial heads up to 500m in 

 diameter, globose, radiate. Conidiophores 1 to 2 mm. long by 20 to 25m 

 in diameter, with walls thin, about 1m in thickness, turgid and studded 

 with granules when examined dry, finely roughened, often collapsing in age. 

 Vesicles 30 to 50m in diameter, nearly globose, fertile over the whole surface. 

 Sterigmata in one series, 8 to 12m by 3 to 4m, producing loosely radiating 

 chains of conidia, at first yellow or golden then brown. Conidia lemon- 

 shaped, 5 to 9m by 5 to 6m, rough from irregularly branching ridges of 

 coloring substance between the inner and outer walls. Sclerotia or per- 

 ithecia verbally reported by Thaxter but not seen by us. 



Diagnosis based on Thaxter's isolate (Thorn Xo. 4181.10). Thaxter 

 gave no description. He obtained it several times from caterpillar dung. 

 It grows and fruits more abundantly on Sabouraud's agar but it is difficult 

 to keep viable in stock cultures. Additional collections include strains 

 from caterpillar dung in Ann Arbor, Michigan, and Hanover, New Hamp- 

 shire. 



Aspergillus lutescens Bainier nomen nudum; described by Thorn and 

 Church, in The Aspergilli, p. 193. 1926. 



Colonies upon Czapek's solution agar rapidly growing and broadly 

 spreading, floccose-woolly, at first white, becoming rusty-yellow as conidial 

 formation begins and develops unevenly over the surface (fig. 68 A), 

 finally becoming chestnut-brown when conidial areas are mature; reverse 

 of colony pale yellow. Conidial heads radiate, hemispherical to subglobose, 

 approximately buckthorn brown to Dresden brown (Ridgway, PI. XV), 

 comparatively small, ranging from 100 to 300m in diameter. Conidiophores 

 12 to 15m in diameter, varying greatly in length, mostly short, arising from 

 the substratum, or as branches of aerial hyphae with walls pale yellowish 

 and with pitting present but not conspicuous, not giving a rough appearance. 

 Vesicles globose to subglobose (fig. 68 B), 20 to 40m in diameter. Sterigmata 



