BIVERTICILLATA-SYMMETRICA 619 



mata. The stock strain is extremely variable in culture and from it, 

 substrains have been developed which duplicate the species description 

 presented above. Occasional substrains are strongly suggestive of the 

 vari-colored colonies of Penicillium islandicum Sopp. 



NRRL 1034, received in 1926 from Miss Bottomley, Pretoria, South 

 Africa, differs from the species proper in producing restricted colonies upon 

 all substrata. Colonies on Czapek's agar are comparatively close-textured, 

 sometimes produce abundant deep red exudate and show red to deep red 

 shades in reverse; upon malt agar colonies are conspicuously tufted, funicu- 

 lose, with sterile yellow mycelium abundantly evident in marginal areas., 

 and produce a fragrant odor suggestive of Penicillium purpurogenum; 

 penicilli and conidia are typical of P. funiculosum. A culture received 

 from the Centraalbureau in June 1946 as P. minio-luteam Dierckx, isolated 

 in 1931 from narcissus, duphcates NRRL 1034 in all essential cultural and 

 structural characteristics. 



NRRL 2118, received in March 1946 from Professor W. H. Weston, 

 Harvard University, as an isolate from deteriorating military equipment, 

 is characterized by floccose-funiculose colonies with abundant pinkish 

 buff vegetative mycelium, limited yellow-green conidial areas and abundant 

 straw-colored exudate; reverse is in orange to deep red shades; penicilli are 

 characterized by unusually long metulae and sterigmata; conidia are 

 smooth-walled and strongly elliptical, about 3.3 to 3.8^ by 1.8 to 2.4/i. 

 The strain is regarded as possibly approximating the type of culture upon 

 which the species Penicillium pinophilum Hedgcock was originally based 

 (seep. 620). 



NRRL 1132, isolated as a culture contaminant in Washington, D. C, 

 in September 1940, is characterized by the production of strongly funiculose 

 colonies with central areas up to 5 or 6 mm. deep; reverse orange-red to 

 cherry red; conidiophores bear relatively short penicilli; walls of conidio- 

 phores, metulae, and sterigmata are comparatively heavy and definitely 

 greenish. In older cultures on malt extract agar, this strain characteris- 

 tically produces reddish brown to dark brown sclerotium-like bodies, 

 usually embedded in the upper surface of the agar medium. Except for 

 limited differences in color, these structures are strongly suggestive of the 

 sclerotia that characterize Penicillium novae-zeelandiae van Beyma. The 

 sclerotia differ from those of P. purpurogenum var. ruhri-sclerotium Thom 

 primarily in being produced within, rather than upon the surface of the 

 substratum. 



NRRL 1035, received in 1936 from George Smith, London School of 

 Hj^giene and Tropical ^Medicine, as an unidentified culture, is characterized 

 by rapidly spreading, strongly funiculose, heavily sporing, light gray-green 

 colonies showing httle or no yellow to red colors in mycelium or reverse; 



