ASYMMETRICA-LANATA 435 



zonation in marginal areas only, floccose, about 1-2 mm. deep, conspicu- 

 ously marked by deep radial furrows (fig. 113C), with marginal areas 

 broad and white during the growing period, conidial areas at first in rather 

 bright green shades such as water green, grape green or pois green (Ridg- 

 waj', PI. XLI), fading unevenly to light shades of olive gray in age; exu- 

 date abundant, in small colorless drops, partially embedded in the mycelial 

 mass; odor pronounced, penetrating; reverse uncolored or tardily and 

 unevenl}' developing drab shades; conidiophores arising from the sub- 

 stratum or from aerial hyphae, up to 1000^ by 4.0 to 5.0/z, more or less 

 sinuous or fiexuous, with walls conspicuously roughened; penicilli about 

 40 to 50// long with walls of lower elements commonly roughened, asjon- 

 metric, irregularly branched and bearing tangled chains of conidia (fig. 

 112Ai); with metulae produced at different levels and variouslj^ duplicated 

 b}^ secondary metulae, often producing sterigmata at several levels; both 

 metulae and sterigmata tending to fall away in mounted preparations from 

 older areas; branches 20 to 40m long, more or less divergent; metulae 15 

 to 20;U long with apices usually enlarged (fig. II2A2); sterigmata mostly 

 10 to 12^1, less commonly 14 to 18m by 3.0 to 4.0^ in diameter, often taper- 

 ing gradually to rather long tubes; conidia globose to subglobose, mostly 

 about 4.0 to 4.5/i in diameter but occasionally showing cells much larger 

 and more or less elliptical, smooth, thin-walled. 



Colonies upon steep agar growing more luxuriantly, attaining a diameter 

 of 3.0 to 4.0 cm. in 10 to 12 days, but showing the same general growth 

 characteristics and coloration as on standard Czapek's agar; penicilli 

 commonly larger than above, measuring up to 75 to 80m in length but 

 similar in pattern. 



Colonies upon malt extract agar appearing somewhat thinner and less 

 floccose than upon the above substrata, but with conidial areas similarly 

 colored (fig. 113D) ; in marginal areas often showing a suggestion of fascicu- 

 lation Avith the conidiophores and some ascending sterile hyphae tending to 

 aggregate into poorly defined clusters or bundles; fruiting structures often 

 less completely branched, but with individual parts generally larger. 



The type culture, NRRL 879 (Thom No. 5034.12), was received in 

 January 1939 from J. H. Birkinshaw, Nobel Explosives Company, as an 

 isolate from the "sweet waters" of a glycerine still at Ardeer, Scotland. 

 Colonies of the type show a striking resemblance to Penicillium psitta- 

 cinum Thom in the bright "parrot-green" colors developed in conidial 

 areas on certain substrata, particular^ malt agar. It differs from that 

 species, however, in lacking distinct zonation, and in lacking the ropes of 

 hyphae clearly evident at the edges and over the surface of the older colo- 

 nies of P. psittacinum. Its coloration and the general characteristics of its 

 fruiting structures is also suggestive of the P. viridicatum series, a possible 

 relationship that is further indicated by the tendency to become fascieu- 



