MONOVERTICILLATA 179 



Czapek but darker; penicilli as on Czapek, with spore columns 100 to 200^ 

 long, conidia somewhat more regular in size and slightly rougher. 



Colonies on malt extract agar about 4.0 to 5.0 cm. in diameter in 12 to 

 14 days, darker near olive green to dark olive green; reverse pale but in 

 same general shades as on Czapek; penicilli as described above but with 

 spore columns up to 400 to 500m long, breaking away in crusts when the 

 culture plate is tapped. 



Species description centered upon NRRL 720, a soil culture received in 

 1932 from Professor G. R. Bisby, University of Manitoba, Winnepeg, 

 Canada; and NRRL 2052, received in May 1945, from Dr. W. Lawrence 

 White, Philadelphia Quartermaster Depot, as an isolate from a leather 

 strap in Finschafen, New Guinea. Strains showing the large globose and 

 roughened conidia, the dark blue-green conidial areas, and the reddish 

 purple reverse of this species are occasionally isolated from soil or soil 

 contaminated materials. Over a period of many years, cultures showing 

 this general morphology have come in from widely scattered sources, and 

 Penicillium purpurrescens, appears to be less abundant but, like other 

 members of the P. freqiientans series, cosmopolitan in its distribution. 



In identifying NRRL 720, NRRL 2052, and similar strains with Sopp's 

 species, we are aware that the conidia in our cultures rarely attain the 

 diameter of 6ju reported by him. Nevertheless, we feel justified in broad- 

 ening his diagnosis (based upon a soil isolate) to include these monoverti- 

 cillate forms with globose and conspicuously roughened conidia that 

 regularly produce purple-red in reverse. There is adequate agreement 

 between our cultures and Sopp's figures and general species description 

 except for conidial measurements, and in this regard the disparity is not 

 too great. We believe we can justifiably assume that the type (not seen 

 by us) represented a unique strain, possibly some variant, showing very 

 large conidia since among all the cultures examined by us, we have at no 

 time encountered a strain consistently producing conidia Gju in diameter, 



A culture received from the Centraalbureau in July 1946, as Penicillium 

 trzebinskii Zaleski (originally from Zaleski in 1928) fails to satisfy the 

 description of that species, and differs from P. purpurrescens (Sopp) 

 n. comb, only in producing conidial areas even darker green in color, and 

 colony reverse in pale orange-red rather than purple-red shades. Conidia 

 are rough-walled, irregular in form, and occasionally 5.5 to O.Oju in diameter. 

 The apices of sterigmata are commonly enlarged (as noted by Sopp in his 

 Citromyces virido-albus) as if a conidium were continuing to grow in the 

 absence of a bisecting wall. 



A second culture received from the Centraalbureau in ]May 1946, as 

 Penicillium internascens Szilvinyi, originally from Professor Janke in 

 Vienna, dupUcates almost exactly the description of P. purpurrescens as 



