ASYMMETRICA-LANATA 439 



a fairly close stand, with dimensions as on steep agar, conspicuously 

 roughened; penicilli generally larger than above and regularly more elabo- 

 rately branched. 



This species is characterized particularly by its dull, gray-green conidial 

 areas and its strong, penetrating actinomyces-like odor which is especially 

 pronounced on Czapek's solution agar. 



Represented in our Collection by the type strain, NRRL 885 (Thorn's 

 Xo. 39). This culture was isolated by Thorn in 1904 from cheese and has 

 retained its distinguishing cultural characteristics since that time. A 

 culture received from the Centraalbureau in 1946 as Thom's culture of 

 Penicillium hijorme represents a deeply floccose, essentially white, sparsely 

 sporulating strain which may or may not represent a cultural variation 

 from the original; penicilli, when produced, duplicate essentially those of 

 XRRL 885 but the odor is much less marked than in the typical culture. 

 The species bears a striking resemblance to P. commune Thom, and in 

 cultural appearance is likewise suggestive of P. puherulum Bainier (see 

 p. 497). 



Penicillium commune Thom, in U. S. Dept. Agr., Bur. Anim. Ind., Bui. 

 1 18, pp. 56-57, fig. 19. 1910 ; Thom, The Penicillia, pp. 324-325.. 



figs. 46 and 47. 1930. 



Colonies on Czapek's solution agar attaining a diameter of 3.0 to 4.0 

 cm. in 10 to 12 days at room temperature, floccose, with mass of mycelium 

 about 500 to 700m deep, marginal zone white, about 2 mm. wide (fig. 114C), 

 followed by zones of gray-green, court gray, gnaphalium green and pea 

 green (Ridgway, PI. XLVII) becoming olive-gray to mouse gray in age 

 (R., PI. LI), at times showing few to several shallow radiate furrows, 

 spreading evenly as submerged and aerial hyphae at colony margins 

 and quickly developing into a complex felt of branching hyphae, the re- 

 sulting felt being rather tough and showing at the margin a trace of 

 fasciculation or ropiness (suggestive of Penicillium solitum); exudate 

 colorless, limited, and enmeshed in the floccose mycelial mass; odor fairly 

 strong, "moldy"; reverse colorless or yellowish, sometimes with traces of 

 rose; conidiophores varying from very short up to 500m by 5.0m in marginal 

 areas of older colonies, with walls finely roughened to coarsely granular in 

 age, bearing penicilli 40 to 50m in length and ranging up to 80m; penicilli. 

 branched, asymmetrical (fig. II2C2), characterized by appressed branches 

 and metulae often borne at different levels, conidial chains tending to form 

 compact masses at first but often diverging in age to produce a loose 

 tangled mass (fig. 112Ci); branches variable in dimensions up to 15.0 to 

 20.0m in length ; metulae 15.0 to 20.0m by 3.0 to 3.5m; sterigmata few in the 

 verticil, usually produced at approximately the same level, measurmg 



