414 A MANUAL OF THE PENICILLL^ 



Westling under this name and discussed by Thorn in 1930, closely approximated P. 

 stoloniferum Thorn, with which the species should be regarded as synonymous. 



Penicillium biourgeianum Zaleski (in Bui. Acad. Polonaise Sci.: Math, et Nat. Ser. 

 B, pp. 462-464; Taf. 45 and 48. 1927. Thom, The Penicillia, pp. 296-297. 1930) was 

 described as producing restricted, irregular colonies with conidial areas in blue-green 

 shades and reverse pale yellow to orange. Conidiophores were reported as from 500 

 to lOOfi by 3.0 to 4.0/n, straight or slightly flexuous, with apices usually inflated and 

 with all walls smooth; penicilli irregularly branched, asymmetrical with metulae 

 fairly long 12 to 16m by 2.5 to 3.5/Lt and showing inflated apices; conidia smooth, glo- 

 bose 2.5 to 3.0m in diameter. Thorn's notes (1930) on the type strain described a re- 

 stricted, radiately wrinkled colony with surface velvety, bluish green to green in color 

 becoming olive green or gray-green in age; conidiophores 100 to 200m by 2.0 to 3.0m 

 with apices inflated; penicilli consisting of a single verticil of metulae, or with one 

 branch, and with metulae and sterigmata closely packed at the base. The species 

 was assigned to the P. brevi -com pactum series with his P. stoloniferum. Re-examina- 

 tion of type cultures from the Centraalbureau and from George Smith in our current 

 study show a form indistinguishable from P. stoloniferum Thom except for conidial 

 areas in somewhat darker dull green shades. 



Penicillium paxilli Bainier, in Bui. Soc. Mycol. France 23: 95-96; PI. X, 

 figs. 1-4. 1907. Thom, The Penicillia, pp. 294-296. 1930 



Colonies on Czapek's solution agar attaining a diameter of 3.0 to 4.0 cm. 

 in 10 days to 2 weeks at room temperature, plane or showing a limited 

 number of shallow radial furrows (fig. 108A), heavily sporing throughout, 

 velvety in younger conidial areas with central portion of colonies commonly 

 showing an overgrowth of vegetative mycelium from which secondary 

 conidial structures are developed, growing margins about 1 mm. in width, 

 white, succeeded bj-- a narrow zone of young fruiting structures approxi- 

 mately artemisia green (Ridgway, PI. XLVII) but shading quickly to darker 

 olive green shades near andover green (R., PI. XLVII); exudate abundant, 

 produced as small droplets largely embedded in the mass of upright conidio- 

 phores, commonly showing a cup-like or nodular arrangement of secondary 

 conidial structures surrounding the droplets in older colony areas; odor 

 "moldy", not pronounced; reverse in dull yellow to cinnamon drab shades; 

 conidiophores borne in a dense stand arising primarily from the substratum, 

 occasionally as branches from aerial hyphae, variable in length but com- 

 monly 150 to 200m by 3.5 to 4.0/li, sometimes longer, with Avails slightly 

 roughened; penicilli compact, 20 to 25^ in length, consisting of a single 

 terminal verticil of 5 to 8, or 9 metulae from which arise divergent chains 

 and loose colmnns of conidia up to 100 to 150^ in length; metulae 10 to 12^ 

 by 2.8 to 3.3m, uniform in diameter or with apices only slightly enlarged; 

 sterigmata 8 to 10m by 2.0 to 2.5m; conidia elliptical to subglobose, 2.8 to 

 3.3m in long axis, with walls thin, smooth or nearly so. 



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



