ASYMMETRICA-FASCICULATA 477 



Penicillium ochraceum (Bainier) Tliom, in The Penicillia, pp. 309-310. 



1930. 



Colonies on Czapek's solution agar attaining a diameter of 3.0 to 3.5 

 cm. in ten days at room temperature, in some strains more or less floc- 

 cose, 2 to 3 mm. deep, in others almost velvety, azonate at first but com- 

 monly becoming definitely zonate in age, radiately furrowed, bearing abun- 

 dant conidial structures particularly along inter-colony margins (fig. 

 123A), growing margins white to dull buff in color, conidial areas becoming 

 yellowish olive to dark greenish olive or buffy olive (Ridgway, PI. XXX) 

 when mature; exudate generally abundant, colorless; odor very pro- 

 nounced, penetrating, earthy; reverse in didl yellow to vinaceous shades; 

 conidiophores abundant, arising from submerged hyphae or from a well 

 developed aerial felt, 100 to 200^ or more in length by about 4.0m in di- 

 ameter, with walls conspicuously roughened; penicilli asymmetric, approx- 

 imately 20 to 35iu in length, usually showing one or more branches ter- 

 minating in verticils of metulae and sterigmata (fig. 123C), sometimes 

 showing metulae and sterigmata only, branches and metulae finely rough- 

 ened, metulae and sterigmata more or less divergent and conidial chains 

 either tangled or tending to adhere into loose columns 50 to 100^ in length ; 

 branches 15 to 25^ long by 3.0 to 3.5/i; metulae about 10 to 12/x by 2.5 

 to 3.0m; sterigmata 8 to 10m by 2.0 to 2.5m; conidia globose to subglobose, 

 commonly 3.0 to 3.5m but ranging from 2.5 to 4.0m, with larger cells occa- 

 sionally observed, walls delicately roughened, appearing slightly yellowish 

 in mass under the microscope. 



Colonies on steep agar 3.0 to 4.0 or 4.5 cm. in ten days at room tempera- 

 ture, generally deeper than on Czapek, ranging from floccose to clearly 

 fasciculate (fig. 123B), sporulating more abundantly but with color and 

 general colony pattern as above, conidiophores and penicilli as described 

 on Czapek. 



Colonies on malt agar growing more rapidly, spreading, attaining a 

 diameter of 5 cm. in ten days, generally plane except slightly raised in 

 central area, loose-textured with tendency to become floccose, more or less 

 zonate in marginal areas, commonly becoming definitely fasciculate in age, 

 sporulating abundantly, with coloration in lighter shades than on Czapek 

 or steep agars; conidial structures essentially as above, but with conidio- 

 phores more conspicuously roughened and elements of the penicillus 

 slightly heavier. 



The name is based upon an unpublished usage by Bainier. Among the 

 cultures received by Thorn in 1922 from the Bainier Collection through Dr. 

 daFonseca was a tube labeled "P. ochraceum" . Adopting the name, Thom 

 (1930) made this the basis of a new species based primarily upon the dis- 



