ASYMMETRICA-VELUTINA 345 



PenicilUutn chloro-leucon Biourge (Monogr., La Cellule 33: fasc. 1, j)]). 270-271; 

 Col. PI. VIII and PI. XIV, fig. 79. 1923) is believed to be synonymous with P. corylo- 

 philum Dierckx. As described and figured by Biourge, this species produced peni- 

 cilli more consistently biverticillate than P. corylophilum or P. obscurum; but like 

 them, was characterized by colonies showing dark in reverse, monoverticillate peni- 

 cilli in greater or less numbers, and subglobose to elliptical conidia measuring about 

 3.0 to 3.5m in long axis. If NRRL 799, brought by Dr. Paul Simonart in 1936 from 

 Professor Biourge's Laboratory, represents Biourge's type strain of P. chloro-leucon, 

 and there are reasons to believe that it does, then this species should be considered 

 synonomous with P. corylophilum Dierckx, since this strain duplicates NRRL 802 

 and NRRL 803. 



Penicillium sumatrense v. Szilvinyi, in Archiv f. Hydrobiologie Suppl. Bd. XIV; 

 Tropische Binnengewasser Bd. VI, pp. 551-552, 1936. Careful cultural examination 

 of the type strain, NRRL 779, received from Professor Westerdijk in 1936, shows a 

 striking similarity to P. corylophilum Dierckx. Microscopic examination likewise 

 shows duplication in structural details, with the penicilli usually consisting of a 

 terminal cluster of 2 or 3 or more metulae. A second substrain of v. Szilvinyi's type, 

 received from the Centraalbureau in May 1946, completely duplicates NRRL 779. 

 We are, therefore, led to believe that this species should be dropped, and the culture 

 henceforth regarded as representing P. corylophilum in the broad sense that the 

 species is considered in this Manual. NRRL 779 shows slightly more limited growth 

 on malt and somewhat longer conidiophores than many strains of P. corylophilum, 

 but neither difference is greater than that normally expected among different strains 

 of a single species. 



Penicillium citrinum Thom, in U. S. Dept. Agr., Bur. Anim. Ind., Bui. 118, 

 pp. 61-63, fig. 22. 1910. Emended by Thom in The Penicillia, 



pp. 256-257, fig. 34. 1930. 

 Synonym: P. aurifluum Biourge, in Monogr., La Cellule 33: fasc. 1, 

 pp. 250-252, Col. PI. VII and PL XI, fig. 64. 1923. 



Colonies on Czapek's solution agar (Col. PI. VI) growing restrictedly» 

 generally 2.0 to 2.5 cm. in diameter in 10 to 14 days at room temperature 

 (24 to 25°C.), typically furrowed in a radial pattern (fig. 92A), often con- 

 spicuously so, ranging from velvety in most strains, more or less floccose in 

 some (fig. 92E), to close-textured and almost leathery in others, conidial 

 production varying from light to abundant in different strains and to some 

 degree depending upon the number of colonies in the culture plate, zona- 

 tion more or less evident in some strains, not in others; conidial areas in 

 blue-green shades near celandine green (Ridgway, PI. XLVII) at first, 

 becoming artemisia green to lily green (R., PI. XLVII) at maturity and 

 finally mouse gray to deep olive gray (R., PI. LI) in age, conidium produc- 

 tion often occurring late (after 8 to 10 days) and commonly not uniformly 

 throughout the whole colony, generally heaviest in marginal to submarginal 

 areas; abundant exudate in the form of pale yellow to straw colored drop- 

 lets of varying size usually produced; pronounced mushroom odor in some 

 strains, not marked in others; reverse usually in yellow to orange shades, 



