450 



A MANUAL OF THE PENICILLIA 



Penicillium terrestre Jensen, in Cornell University Exp. Sta. Bui. 315, pp. 

 486-487, fig. 122. 1912. Thorn, The Penicillia, pp. 371-372. 1930. 



Colonies upon Czapek's solution agar spreading broadly, attaining a 

 diameter of 7.0 to 8.0 cm. in 12 to 14 days at room temperature, azonate 

 in most strains, somewhat zonate in others, often deeply ridged in age, 

 floccose-funiculose (fig. 117C), commonly 500/^ to 1 to 2 mm. deep with 

 ropiness readily observed under low magnifications, or occasionally thin- 

 ning to a fraction of this depth and retaining only traces of ropiness, with 

 margin broad, white during the growing period, passing into conidial zones 



Fig. 116. Penicillium terrestre Jensen. Ai-Az, Habit sketches of representative 

 penicilli. By and B^,, Penicilli showing details of cellular structure; conidiophores, 

 branches and even metulae are characteristically roughened. 



in shades of dull gray-green to slightly bluish green approximating mineral 

 gray to celandine green (Ridgway, PI. XLVII), then toward olive-gray 

 and brown shades (R., PI. LI) in old cultures; odor strong, like certain 

 mushrooms; exudate limited in amount, clear; reverse mostly uncolored, 

 or with dull yellow to orange shades sometimes evident in marginal zones; 

 conidiophores about 3/i in diameter, arising from the substratum or as 

 branches from aerial hyphae, varying greatly in length up to 400 to 500;u, 

 with walls roughened as seen under oil immersion; penicilli comparatively 

 large, commonly 40 to 50ju in length, bearing conidial chains at first in 

 loose columns but becoming tangled in age (fig. 116A) ; asymmetric, usually 



