MONOVERTICILLATA 227 



placement of the species remains somewhat in doubt, and assignment to 

 its present position is based upon our behef that it can be keyed here more 

 readily than elsewhere. Its possible closer relationship to the Pemcillium 

 nigricans series in the Divaricata should not be overlooked. If placed in 

 that section it should be considered along with P. albidum Sopp. It 

 differs from this form, however, in producing colonies not predominantly 

 white, in its larger and more coarsely roughened conidia, and in the dark 

 color of its conidiophores. 



Occurrence and Significance 



Forms approximating Penicillium restrictum G. and A. and P. fuscum 

 (Sopp) are not infrequently encountered among molds isolated from soil. 

 Their significance in nature is not known, and no studies of a biochemical 

 nature based upon these species have come to our attention. Their 

 chief interest lies in the fact that they possibly represent transitional forms 

 connecting the Penicillia with the Aspergilli. 



Penicillium adametzi Series 

 Outstanding Characters 



Colonies consisting of a tough basal felt with surface growth usually some- 

 what floccose and regularly showing some development of hyphal ropes 

 or| funicles. Colony reverse often developing orange-red to brown or 

 amber shades. 



Conidiophores arising almost entirely from trailing aerial hyphae or ropes 

 of hyphae, mostly as short perpendicular branches, normally less than 

 lOOju in length and commonly much shorter. 



Penicilli monoverticillate, rarely branched, consisting of terminal verticils 

 of 5 to 10 or more sterigmata bearing conidia in tangled chains or fairly 

 well defined columns. 



Conidia globose or subglobose, mostly 2.0 to 3.0ju, with walls appearing 

 granular or definitely roughened, in light yellow-green to gray shades. 



Series Key 



b. Colonies with funiculose habit predominant or well developed. P. adametzi series 

 1'. Colonies usually developing dull reddish orange to brown shades in reverse. 



aa. Conidia subglobose, 2.0 to 2.5/x, delicately granular P. adametzi Zaleski 



bb. Conidia globose to subglobose, about 3.0m in diameter, definitely rough 



P. terlikowskii Zaleski 

 2'. Colonies quickly developing deep vinaceous to purple colors in reverse and 



agar Vinaceous sub-series 



aa. Exudate abundantly produced, deep vinaceous, conidiophores short, 



rarely more than 50m P- vinaceum Oilman and Abbott 



bb. Exudate lacking or limited, conidiophores longer, 200 to 250m 



P. phoeniceum v. Beyma 



