ASYMMETRICA-DIVARICATA 299 



species should be recognized and that P. krzemieniewskii Zaleski should be regarded 

 as a synonym. 



Penicillium janthinellum Biourge, in Monogr., La Cellule 33: fasc. 1, pp. 

 258-260; Col. PL VII and PI. XII, fig. 70. 1923. See also Thorn, 

 The Penicillia, pp. 238-241. 1930; and Thorn in Pratt in -lour. Agr. 

 Res. 13: 94-95, figs. 3 and 4. 1918. 



Colonies on Czapek's solution agar (Col. PI. Y) spreading, attaining a 

 diameter of 5 to 7 cm. in 10 days at room temperature (24°C.), forming a 

 tough, closely intenvoven felt of fine hyphae, with growing margin broad, 

 with surface growth delicately fioccose, unevenly tufted, or in some strains 

 ropy, irregularly wrinkled in central portions and radially furrowed in 

 marginal colony areas (fig. 81 A), at first white, but in most strains becom- 

 ing variousl}^ colored from the tardy and irregular development of conidial 

 areas, mostly in pale gray to glaucous gray shades (Ridgway, PI. XLVIII), 

 and the simultaneous shading of non-fruiting areas to dull buff, orange- 

 red, or in some strains purple-vinaceous shades (R., PI. XLIV), azonate or 

 broadly zonate; exudate usually lacking or limited, occasionally abun- 

 dantlj' produced, colorless to amber, brownish, or vinaceous; reverse of 

 colonies sometimes colorless, especiall}^ in stock cultures after man}^ trans- 

 fers, but usually in bright shades, in new isolates commonly yellow-green 

 to orange at first, quickly changing to orange-red, maroon or purple-red 

 shades; penicilli typically asjTnmetric, strongly divaricate with conidial 

 chains divergent (fig. 80A) or tangled and commonly up to 200/1 in length, 

 abundantly produced in some strains, less abundantly in others, some- 

 times thinly or evenlj^ distributed over the whole colony but generally 

 more abundant in submarginal areas, borne terminally on ascending coni- 

 diophores up to 500m in length by 3.5^i in diameter, with walls smooth or 

 finely roughened (fig. 80B), or on short branches from aerial hyphae com- 

 monly 10 to 50m by 2.5 to 3.0^, varying in complexity from simple verticils 

 of sterigmata (appearing monoverticillate) (fig. 8OB3) to verticils contain- 

 ing both metulae and sterigmata, or verticils of metulae of unequal length, 

 and occasionally larger structures with metulae and sterigmata borne upon 

 one or more branches in addition to the main axis (fig. 8OB2 and Bi); 

 branches variable, ranging from 10 to 25^ b}^ 3.0 to 3.3m; metulae mostly 

 10 to 15m by 2.0 to 2.5m, but ranging from 7 to 20m in length, with apices 

 more or less vesiculose; sterigmata diverging, enlarged at the base then 

 tapering abruptly to fairly long conidium-bearing tips (fig. 8OB5), mostly 

 8 to 10m by 2.0 to 2.2m; conidia strongl}' elliptical when formed and usuall}' 

 remaining elliptical, but in some strains becoming ovate to subglobose, 

 with ends often apiculate and walls more or less roughened (fig. 80C), 

 commonly 3.0 to 3.5m in long axis. 



