MONO VERTICILL ATA 211 



penicilli almost entirely monoverticillate and only occasionally showing a 

 branch, producing loose columns of conidia up to 100m in length; sterig- 

 mata mostly in compact clusters up to 12 or 15 in number, 7 to Qju by 2.0 

 to 2.5ju (fig. 58D), sometimes borne at two immediately adjacent levels; 

 conidia elliptical to subglobose 2.0 to 2.5iu in long axis, occasionally up to 

 3.0/x, smooth, appearing slightly green under the microscope. 



Colonies on steep agar 3.0 to 4.0 cm. in 2 weeks, usually deeper than on 

 Czapek and showing a more definite margin without submerged zone, 

 central colony areas in dull green shades becoming drab in age; reverse 

 almost colorless to slight yellow^ or orange shades; penicilli more abun- 

 dantly produced and often somew'hat larger than on Czapek, 



Colonies on malt extract agar growing more rapidly, up to 4.0 to 6.0 

 cm. in 2 weeks, plane (fig. 58B) with coloration as described on Czapek 

 but fading in age to gray-brown shades, very heavily sporing; penicilli as 

 described above but producing loose columns of conidia up to 250/i long. 



Species description centered upon NRRL 742 received in 1933 from 

 Professor C. D. Sherbakoff, University of Tennessee, Knoxville, and sev- 

 eral other strains, primarily from soil and deteriorating military equipment, 

 that present the same general morphology. The species appears to be 

 fairly common and is probably world-wide in distribution, since strains 

 from South Africa, Liberia, Panama, the South Pacific Area, and various 

 stations in the United States have been examined. It is characterized 

 primarily by its comparatively thin, loose network of trailing hyphae 

 bearing numerous short-stemmed monoverticillate conidial structures, its 

 coloration, and its distinctly fragrant odor. 



Thom's original description was based upon a strain contributed in 

 1905 by Professor P. H. Rolfs from Miami, Florida. This was subse- 

 quently lost from his collection, but had been sent to Krai in Prague. 

 This strain was subsequently returned to us by Biourge in 1924 and is now 

 maintained in the Collection as NRRL 741. In our current comparative 

 study it differs from the species as described only in producing colonies of 

 somewhat closer texture that are definitely lighter sporing. The au- 

 thenticity of the type is not questioned although it has become somewhat 

 altered during forty years of laboratory cultivation. The present species 

 description has been broadened somewhat beyond Thom's original de- 

 scription (1910) to cover a clearly related group of molds with fairly uni- 

 form morphology. 



A culture received from the Centraalbureau under this name, now main- 

 tained as NRRL 2044, represents the species satisfactorily but tends to 

 produce colonies somewhat deeper and of looser texture than NRRL 742 

 and similar strains. The details of the penicillus, coloration, and the 

 production of the characteristic fragrant odor are the same. A strain 



