THE ASPERGILLUS NIDULANS GROUP 163 



Culturally and microscopically the above strains present similar pictures, 

 with the exception of the strain recently received from Bliss in California 

 (NRRL No. 2 1 1 ) . In contrast to the others, this culture produces abundant 

 conidial heads and relatively fewer perithecia. The ascospores and conidial 

 structures, however, duplicate those of the typical strains; hence we do not 

 at present feel warranted in designating this as a variety, or otherwise 

 separating it from the species A. rugulosus. 



Aspergillus variecolor (Berk, and Br.) Thorn and Raper, in Mycologia 31: 



663-G67. fig. 4D and fig. 5. 1939. 



Synonyms : Emericella variecolor Berk, and Br. in Berkeley, Introd. 



Crypt, Bot. p. 340-341; fig. 76. 1857. See Patouillard, 



Bull. Soc. Myc. Fr. 7: 43-49. pi. 4. fig. 6-12. 1891. 

 Inzengaea erythrospora Borzi, Jahrb. Wiss. Bot. (Pringsheim) 



16: 450-463. pi. 19, 20. (1884) 1885. 

 Emericella medias Chowdhury and Mathur, Ann. Myc. 36: 



61-63. 1938. 

 Aspergillus stellatus Curzi, Rend. Acad. Naz. Lincei 19: 



424-428. fig. 1. 1934. 



Colonies on Czapek's solution agar with vegetative mycelium largely 

 submerged, sparse, spreading slowly in the agar, producing green heads 

 freely in the center of the colony, less abundantly in the outer areas, large 

 gray perithecia produced in clusters in colony center and at the margin in 

 some strains, with smaller perithecia scattered through the intervening 

 thinner areas of the colony (fig. 44 A), in other strains producing large 

 perithecia abundantly throughout the colony (PI. IVD); reverse color in 

 shades of purple-red. Conidial heads green, columnar (fig. 44 D), relatively 

 long, mostly 100 to 200m, occasionally up to 300m by 30 to 40m; conidiophores 

 arising directly from submerged hyphae, straight with smooth walls, cinna- 

 mon-brown in color, mostly 140 to 200m long by 3 to 5m in diameter, 

 broadening gradually to become hemispherical vesicles about 8 to 10m in 

 diameter; primary sterigmata 7 to 8m by 3 to 4m, secondary sterigmata 8 to 

 9m by 2.5 to 3m; conidia globose, rugulose, 3 to 3.5m; perithecia when clus- 

 tered (fig. 44 Aa) 300 to 400m in diameter surrounded by a felt of hyphae 

 and hulle cells and supported by masses of hyphae and hulle cells forming 

 false stalks (fig. 42 F), giving the structures a pyriform appearance (fig. 

 44 B) ; scattered perithecia much smaller (fig. 44 C) and with envelope of 

 supporting cells often much reduced in mass; hulle cells abundant and 

 essentially like those of the species A. nidvlans. 



Perithecial wall when stripped of enveloping cells purple-red, brittle, 

 composed of a single layer of cells; asci quickly ripening and breaking down 

 to leave the cavity filled with ascospores; ascospores purple-red, with spore 

 bodies lenticular and 3.6 to 4m by 2.8 to 3m, with two prominent equatorial 



