190 A MANUAL OF THE ASPERGILLI 



and re-examination of this culture leaves no question but that he was deal- 

 ing with a strain of the species here described, and that the green form 

 which troubled him so much was not, in fact, a contaminant but a different 

 phase of the same fungus. 



Aspergillus janus var. brevis Raper and Thorn, in Mycologia 36 : 561-563, 



fig. 2. 1944. 



The variety differs from the species in a number of particulars, foremost 

 among which are (1) the reduced length of the conidiophores bearing both 

 white and green heads and (2) a consistent tendency for white and green 

 conidial structures to develop in approximately pure stands and to appear 

 as contrasting radial sectors. 



White conidial heads are of the same general pattern and form as in the 

 species, but are of somewhat smaller dimensions, are borne upon conidio- 

 phores generally less than 2 mm. in length by 6 to 8m in diameter, and are 

 characterized by elongate but not strongly clavate vesicles measuring 20 

 to 25^ by 14 to 18m; conidia are smooth-walled, colorless, globose to sub- 

 globose, 2.2 to 2.8m in diameter. Green conidial heads are compact, glo- 

 bose to somewhat columnar, borne upon conidiophores 75 to 125m by 4 to 

 6m with globose to subglobose vesicles measuring 8 to 15m by 10 to 18m; 

 conidia are dark blue-green, strongly echinulate, and 3.5 to 4.5m in diameter. 



The vesicles of white heads in the variety brevis are of approximately the 

 same size and form as the vesicles of green heads in the species itself, 

 whereas the conidiophores bearing each type of head are approximately 

 one-half the length of those bearing the same type of head in the species. 

 The most striking character distinguishing the variety, however, is the 

 manner in which areas of white and green heads are sharply separated along 

 radial lines. Conidial heads of mixed character are produced and usually 

 can be found along the frontier between white and green sectors. 



Type culture NRRL No. 1935 was isolated in July 1942 from a sample of 

 soil collected in Alameda in southern Mexico, and forwarded to us in June 

 by Mr. William B. Roos. 



Aspergillus versicolor (Vuill.) Tiraboschi, in Ann. Botan. (Rome) 



7:9. 1908. 



Synonym: S. versicolor Vuillemin. Mirsky, B., in These de Med. 

 Nancy, no. 27, p. 15 et seq. 1903. See Thorn and Church, 

 The Aspergilli, p. 142, 1926. 



Colonies upon Czapek's solution agar rather slow growing, compact, in 

 some strains velvety and consisting almost entirely of closely crowded 

 conidiophores arising from the substratum, in other strains showing a 

 marked development of floccose hyphae bearing more or less abundant 



