ASYMMETRICA-DIVARICATA 319 



Colonies on steep agar growing more rapidly than on Czapek, sporulating 

 somewhat more abundantly and more quickly developing gray shades, but 

 otherwise essentially as described above; penicilli generally larger and more 

 frequently borne upon long conidiophores arising from the substratum, 

 but in general pattern duplicating the above. 



Colonies on malt extract agar 2.5 to 3.0 cm. in 10 to 12 days, loose- 

 textured, floccose, somewhat funiculose (fig. 85B), about 1 mm. deep, 

 approximately gnaphalium green in color, evenly sporulating throughout; 

 no exudate produced; reverse in rich brown shades; penicilli as on steep 

 agar but showing a more definite tendency to produce persistent columns 

 of spores. 



Species description leased upon culture XRRL 910 (Thom No. 2654) 

 received from Miss Dale in England in 1912 and cited by Thom in 1930 as 

 representing this species. A second strain of this culture which duplicates 

 the preceding in all particulars, was obtained from the Centraalbureau in 

 1946 and has been included in the present study. The species is occa- 

 sionally encountered in soil population studies. 



Pemcillium canescens is believed to be somewhat transitional between 

 P. janthmellftm and P. nigricans. Colonies grow more restrictedly than 

 the members of the former series; they produce rich brown rather than 

 purple-red colors in reverse, suggestive of P. nigricans; and conidia are 

 globose and rough, although not so conspicuously so as in typical P. 

 nigricans strains. While the character is less marked, conidial areas tend 

 toward grays rather than blue-greens, further suggesting relationship to 

 P. nigricans. 



Penicillium nalgiovensis Laxa, in Zentbl. f. Bakt. etc. (II) 86: 



160-165. 1932. 



Colonies upon Czapek's solution agar restricted, attaining a diameter of 

 3.0 to 3.5 cm. in 12 to 14 days at room temperature (24°C.), deeply floc- 

 cose or lanose, consisting of a fairly close network of vegetative mycelia 

 2 to 3 mm. deep, lightly furrowed in a radial pattern (fig. 85C), somewhat 

 zonate, at first white but after one week gradually developing conidial 

 structures sparsely over most of the colony surface and becoming pale 

 yellow-green, near celandine green (Ridgway, PI. XLVII) in fruiting areas 

 and usually assuming a flesh to pinkish tint in areas of purely vegetative 

 growth, with marginal zone 3 to 4 mm. wide remaining uncolored, margins 

 entire, not thinning perceptibly except in areas adjacent to other colonies; 

 limited exudate produced as smaU droplets embedded in the colony, amber 

 or vinaceous in color; odor lacking or indefinite; reverse in orange-red to 

 maroon shades with surrounding agar similarly but less intensely colored; 



