ASYMMETRICA-DIVARICATA 313 



to 4.5m in diameter; conidia globose to subglobose, 2.0 to 2.5^ in diameter 

 with walls smooth or nearly so, olive-green in mass. 



Colonies on steep agar growing as on C'zapek but more closely wrinkled 

 and with ropiness usually prominent, fairly heavy sporing throughout, at 

 first pale blue-green as above, in age becoming smoke gray or light grayish 

 olive (R., PI. XLVI); exudate lacking; odor indefinite; reverse uncolored 

 or in light yellowish shades; penicilli as described above. 



Colonies on malt extract agar growing more rapidly, up to 4.0 to 5.0 

 cm. in 2 to 3 weeks at room temperature, thin, plane except in limited 

 central area (fig. 83D), with broad margin 6 to 8 mm. largely submerged, 

 medium sporing throughout, conidial structures commonly smaller than 

 above and arising from the substratum or borne on trailing hyphae or 

 lunited ropes of hyphae; reverse in yellow shades with surrounding agar 

 similarly colored. 



Species description centered upon the type strain, NRRL 2111, received 

 from the Centraalbureau in April 1946, and upon Thom's notes made 

 upon the same type prior to 1930 and reported in his Monograph (p. 366). 

 Strains approximating this species are not infrequently encountered in 

 soil population studies. They commonly developed as wet, sodden, more 

 or less bristly to funiculose colonies and characteristically produce a limited 

 crop of conidia. They are rather difficult to maintain in culture. 



A culture received from the Centraalbureau in August 1946 as Peni- 

 cillium urnhonatum Sopp, from Biourge in 1933, fails to satisfy the de- 

 scription of that species, but approximates P. godlewskii closely enough to 

 be considered here. 



The correct placement of Penicillium godlewskii is open to question. 

 The divaricate character of its fruiting structures warrant placement near 

 this point although it cannot be satisfactorily assigned to any well-defined 

 series in the Divaricata. It is distinct from the P. janthinclliwi series 

 in the character of its sterigmata and its general cultural habit. It cannot 

 be keyed satisfactorily with P. canescens and other species adjacent to it 

 since it shows no tendency to develop columns of conidia. It is excluded 

 from the P. nigricans series by its blue-green color and by its smooth- 

 walled conidia. Thom (1930) regarded this species as belonging in his 

 section Asymmetrica-Funiculosa because of the funiculose habit of its 

 aerial growth. Continued study of this character over a period of years 

 has rendered it of doubtful value in this connection, since almost any 

 member of the Divaricata may show this in varying degree when colonies 

 tend to be wet or otherwise appear unhealthy. 



Weighing the above considerations, we believe that the species can be 

 best keyed adjacent to the Penicillium janthinellum series although it is 



