BIVERTICILLATA -SYMMETRICA 603 



and the same time the oldest of the specific names and the most generally 

 descriptive. 



An additional culture, NRRL 2103, isolated from Swedish soil in Janu- 

 ary 1946, produces ascospores with transverse banding less marked but 

 strongly suggestive of Penicillium luteum as described above. It differs 

 from NRRL 1010, however, in producing more rapidly growing and less 

 highly pigmented colonies. It also produces typical biverticillate-sym- 

 metrical penicilli in abundance upon most substrata. This culture is not 

 regarded as representing the species P. luteum Zukal, and its proper assign- 

 ment remains in doubt. We believe, however, that forms similar to this 

 — should they be encountered by others — can be more easily located here 

 than elsewhere. It is, therefore, tentatively considered adjacent to P. 

 luteum upon the character of its ascospores. The isolation and examina- 

 tion of additional cultures may tend to lessen the significance of a spore 

 character now regarded as unique and diagnostic. For the present, how- 

 ever, ascospores with transverse bands are reported only in the single 

 species, P. luteum. 



Penicillium striatum Raper and Fennell, in Mycologia, 40: 521-524, fig. 5. 



1948; also Williams, Cameron, and Williams in Food 



Research 6: 69-73. 1941. 



Colonies on Czapek's solution agar growing very restrictedly (fig. 157A), 

 attaining a diameter of 1 to 1.5 cm. in 2 weeks at room temperature, with 

 margin uneven from the irregular and localized growth of the vegetative 

 mycelium, growing deeply in the agar with aerial hyphae and later peri- 

 thecia developing above this deep mycelial growth, white to pale buff in 

 color, with surface mealy or granular, conidial structures very limited in 

 number and not affecting the colony appearance, vegetative mycelium com- 

 paratively coarse with hyphal tips at colony margin often showing inflated 

 cells, perithecia abundantly produced, developing throughout the entire 

 colony area, loose-textured, cottony, without definite cellular walls, ranging 

 up to 100 to 150/i in diameter (figs. 156E and 157C) ; exudate not produced; 

 odor lacking or indefinite ; reverse at first colorless becoming dull brown in 

 age; penicilli very sparsely produced (see colony description on 20 per cent 

 sucrose Czapek). Perithecia ripening rather quickly with asci containing 

 immature spores within 7 to 8 days and with ripe ascospores present in 12 

 to 14 days; asci apparently arising as branches from fertile hyphae, not in 

 chains (figs. 156D and 157E), oblong to spherical, about 15^ in diameter, 

 8-spored; ascospores comparatively large, elliptical, with over-all dimen- 

 sions ranging from 7.0 to 8.5 by 5.0 to 6.0m, with walls bearing a series of 

 wavy, longitudinal flanges or frills (fig. 157F), about l.O/x in Avidth, usually 



