ASYMMETRICA-VELUTINA 367 



of a species, as described above, is necessary, however, to include strains 

 with obvious relationships here which show the several characters recog- 

 nized by Thom and attributed to P. meleagrinimi Biourge. 



Penicillium notatum Westling, in Arkiv for Botanik 11: 55, 95-97, figs. 17' 

 59. 1911. See also Biourge, Monograph, La Cellule 33: fasc. 1, pp- 

 179-181,Col. PL IVandPl.VIII, fig. 37. 1923. Thom, The Penicillia' 

 pp. 264-265. 1930. 



Colonies on Czapek's solution agar growing fairly rapidly in most strains 

 (fig. 97A, C, D, and F), attaining a diameter of 3.5 to 4.0 cm. in 10 to 12 

 days at room temperature, in some strains more restricted (fig. 97E), not 

 exceeding 2.5 to 3.0 cm., consisting of a fairly close-textured basal felt 

 bearing abundant conidial structures, commonly azonate, usually showing 

 conspicuous radial furrows to produce a wheel-like appearance, heavily 

 sporing throughout except for a white to yellowish growing margin 1 to 

 2 mm. wide in most strains, in others rather light-sporing and yellowish in 

 colony centers; conidial areas in blue-green shades usually ranging from 

 celandine through artemisia to lily green (Ridgway, PL XLVII), in some 

 strains becoming darker near Russian green to deep bluish gray-green (R., 

 PI. XLII) to slate olive in age; exudate abundantly produced in most 

 strains, often collecting in large drops, 2 to 3 mm. in diameter, clear yellow 

 to light amber in color, tending to reduce spore production and markedly 

 affecting the overall colony appearance ; odor not pronounced ; reverse yel- 

 low to golden yellow, commonly becoming light bro^vn in age, with the 

 pigment diffusing throughout the substratum; conidiophores arising pri- 

 marily from the basal felt, variable in length from 250 to 500ju by 2.5 to 3.0jli 

 in some strains or 3.0 to 3.5iu in others, with walls smooth and colorless; 

 penicilli biverticillate, sometimes showing one or more fertile branches but 

 commonly consisting of a simple terminal verticil of metulae bearing clus- 

 ters of sterigmata (fig. 98A and C), and conidial chains up to 50-75^ in 

 length, tangled or adherent into fairly well-defined columns; branches, when 

 present, variable in size, mostly 10 to 15m by 2.5 to 3.0/1 ; metulae usually 

 in groups of 3 to 5, variable in length, ranging from 9 to 16ju by 2.5 to 3.0At 

 but commonly 10 to 12jLt in length; sterigmata commonly borne in verticils 

 of 4 to 6, mostly 8 to lOju by 2.0 to 3.0/z, terminating rather abruptly; 

 conidia globose to subglobose, mostly 3.0 to 3.5/x in diameter, less commonly 

 showing some ellipticity, smooth-walled, yellowish green in mass. 



Colonies on steep agar growing somewhat more rapidly but similar to 

 the above in general pattern and texture, strictly velvety, heavily sporing 

 throughout, usually in slightly darker shades, conspicuously furrowed in a 

 radial pattern; exudate abundantly produced; odor lacking or indefinite; 

 reverse and agar in duller shades than on Czapek's agar, near deep colonial 



