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A MANUAL OF THE PENICILLIA 



Colonies on malt extract agar duplicate the authors' description for 

 wort agar by remaining sterile for several weeks but, in our experience, 

 fail to produce abundant conidial structures when placed in diffuse light. 



Fig. 118. A and B, Penicillium resticulosum Smith, NRRL 2021, on Czapek and 

 steep agars. C, Detail of penicillus in the same strain, X 750. D, Low-power view 

 of colony margin showing funiculose habit of aerial growth, X 70. 



The species is easily distinguished, being characterized by its spreading, 

 funiculose habit and its pronounced reddish brown pigmentation. 



Occurrence and Significance 



Penicillium terrestre Jensen and P. solitum Westling represent cosmo- 

 politan fungi which may be encountered in almost any soil examined, or 



