ASYMMETRICA-DIVARICATA 333 



PenicilUum radhorsUi Zaleski, in Bui. Acad. Polonaise Sci.: Math, et 

 Nat. Ser.B, pp. 454-455; Taf. 36. 1927. Thorn, The Penicillia, 



pp. 318-319. 1930. 



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

 em. in 2 weeks, consisting of a fairly tough basal felt with surface some- 

 what flocculent, strongly wrinkled and buckled but lacking definite pat- 

 tern, in white to light gray-green shades, conidial structures abundantly 

 produced along inter-colony margins and less abundantly throughout, near 

 tea green (Ridgway, PI. XLVH); exudate limited, clear, colorless; odor 

 slightly moldy, not pronounced; reverse dull peach, slowly developing 

 vinaceous shades; penicilli biverticillate and asymmetrical, usually strongly 

 divaricate, with conidial chains forming 2, 3, or more loose to fairly defi- 

 nite columns up to 75 or 100/x in length; conidiophores arising from the sub- 

 stratum or as branches from aerial hyphae, variable in length, rarely more 

 than 200m in length by 2.0 to 3.0m in diameter, with walls generally appear- 

 ing smooth; penicilli irregularly branched, with branches and metulae 

 variable in size and often borne from the same level, the former commonly 

 10 to 18m by 2.0 to 2.5m, the latter 8 to 12m by about 2.0m with apices 

 conspicuously enlarged to form dome-like vesicular areas up to 3.0 to 4.0m 

 or more in diameter; sterigmata crowded, closely parallel, in compact 

 clusters of few to 10 or more, about 7.0 to 8.5m by 1.5 to 2.0m, ^vith apices 

 narrowed; conidia globose to subglobose, very small, thin-walled, about 

 1.5 to 2.0m, ^vith walls smooth or faintly granular. 



Colonies on steep agar like the above but growing somewhat more 

 rapidly and sporulating more heavily throughout the entire colony area, 

 with growing margins white, quickly becoming dull gray-green near tea 

 green (R., PI. XLVII) and finally olive gray (R., PI. LI) in age ; exudate 

 fairly abundant, slightly colored; odor more pronounced, moldy; reverse 

 in dull reddish brown shades, penicilli as on Czapek. 



Colonies on malt agar spreading broadly, 6 to 7 cm. in 10 to 12 days, 

 comparatively thin, plane, with surface marked by a loose, overgrowth of 

 flocculent hyphae, heavily sporing throughout in dull gray-green shades; 

 exudate lacking; reverse in yellow-browns; penicilli as described above but 

 often larger and with walls of conidiophores, branches, and metulae con- 

 spicuously roughened. 



Species description centered upon NRRL 2150, received from the Cen- 

 traalbureau in May 1946, presumably Zaleski's type; duplicated in essen- 

 tial particulars by Thom's notes on Zaleski's culture (now lost from our 

 Collection) made in 1928 and reported in his :\Ionograph (1930, pp. 318- 

 319). 



PenicilUum raciborskii Zaleski was included in the Lanata by Thom in 

 1930. However, comparison with members of that section and with mem- 



