248 A MANUAL OF THE PENICILLIA 



group in the Ramigena series, whereas, P. corylopMlum is considered as 

 more closely related to P. citrinum, hence is placed in that series. 



Penicillium charlesii Smith, in Brit. Myc. Soc. Trans. 18: 90-91, PL V, 



figs. 7 and 8. 1933. 



Colonies on Czapek's solution agar growing rather restrictedly, attain- 

 ing a diameter of 2 cm. in 10 to 12 days, strongly buckled, and wrinkled 

 with central area commonly depressed (fig. 68C), consisting of a com- 

 paratively thin, close-textured, tough basal felt, appearing velvety or nearly 

 so, medium to light sporing throughout, heavier in submarginal area, in 

 dull green shades near artemisia or lily green (Ridgway, PI. XLVII) 

 becoming olive gray in age, with growing margin thin, narrow, rarely 

 exceeding 1 mm., white; exudate lacking; odor slight, nor distinctive; re- 

 verse in dull greenish shades; conidiophores arising from creeping or 

 closely interwoven aerial hyphae, simple or variously branched, occasion 

 ally showing a fairly compact group of metula-like branches, each branch 

 bearing a monoverticillate penicillus (fig. 68E) with conidial chains form- 

 ing a compact coliunn up to 150ju or more long, conidiophores variable in 

 length from very short up to lOO/x or more by 2.0 to 2.5/i in diameter with 

 terminal area enlarged, occasionally wedge-shaped or more commonly 

 with apices inflated, somewhat vesicular about 4.0 to 5.0m, walls smooth 

 or nearly so in our cultures (reported as slightly roughened by G. Smith), 

 sterigmata in compact clusters, roughly parallel, numbering up to 10 or 

 12 in the verticil, 7.5 to 9.0/x by 2.2 to 2.5/x; conidia ovate to slightly ellipti- 

 cal, roughened, mostly 2.5 to 3.0^ by 2.0 to 2.5m, dark green in mass. 



Colonies on steep agar growing more rapidly, 2.5 to 3.0 cm. in 10 to 

 12 days, strongly and radially wrinkled with central areas variously um- 

 bonate or depressed, comparatively thin, close-textured, tough, appearing 

 velvety, heavily sporing throughout in deep blue-green shades approxi- 

 mating lily green (R., PI. XLVII); no exudate; odor not distinctive; re- 

 verse uncolored or in light drab shades; conidiophores as described above 

 but commonly up to 200m in length; penicilli as described above but more 

 frequently developing from terminal aggregates of metula-like branches 

 and, in individual penicilli, not infrequently showing sterigmata and 

 "metulae" borne from the same node; conidia as described above. 



Colonies on malt agar growing restrictedly, about 1.5 cm. in 10 to 12 

 days, plane or slightly umbonate in central area, velvety, heavily sporing 

 throughout, deep blue-green near lily green, no exudate; no odor; reverse 

 uncolored; conidiophores arising mostly from submerged or ascending 

 aerial hyphae, commonly 200m or more in length by 2.0 to 2.5 or 3.0m in 

 diameter with walls often appearing finely granular, loosely branched 



