MONOVERTICILLATA 215 



Penicillium dierckxii Biourge (Monograph, La Cellule 33: fasc. 1, pp. 313-315; 

 Col. PL X and PL XVI, fig. 91. 1923) was described in terms approximating P. fellu- 

 tanum of the same author, except for the development of reddish brown to dark blood 

 red colors in reverse on wort gelatine. Thom's study of the type strain No. 4733.50 

 (now maintained as NRRL 755) in 1928 generally confirmed Biourge's description. 

 Examination of NRRL 755 for the present study shows colonies restricted but less 

 highly colored in reverse, conidiophores longer and commonly branched in the termi- 

 nal area, and conidia averaging somewhat larger than reported by Thom (1930). 

 There is some question, therefore, whether NRRL 755 adequately represents Bi- 

 ourge's organism. In the absence of any other strains which are clearly assignable 

 to P. dierckxii, we believe that it can best be regarded as having represented a variant 

 member of what we now consider P. fellutanum Biourge. 



Penicillium cinerascens Biourge (Monograph, La Cellule 33: fasc. 1, pp. 308-309; 

 Col. PI. IX and PI. XIV, fig. 81. 1923) is believed to approximate P. fellutanum of 

 the same author. Colonies were described as restricted with trailing or ascending 

 hyphae, at first slightly bluish green, then gray-green to gray and at length reddish 

 brown, reverse pale yellow, conidiophores smooth-walled and short, about 35,ju and 

 borne upon ascending (aerial) hyphae; conidia were described as oblong to globose 

 and rough echinulate when ripe. Only in the character of the conidia does the species 

 differ substantially from P. fellutanum, and in Biourge's figures these are shown as 

 oblong to elliptical and apparently smooth-walled. Thom failed to receive Biourge's 

 number 50, the type strain, but did receive his number 90, labeled P. cinerascens. 

 This latter culture is discussed by Thom in his Monograph (1930, p. 201) as number 

 4733.34 and agrees reasonably well with Biourge's observations except conidiophores 

 were reported as substantially longer, and the conidia as elliptical to globose and 

 (apparently) smooth-walled. This latter culture is now maintained in our collec- 

 tion as NRRL 748 and retains the characteristics reported by Thom. The strain, 

 while culturally distinct, belongs in the series with P. fellutanum Biourge and is not 

 believed to warrant recognition as a separate species. 



Penicillium citreo-viride Biourge, in Monograph, La Cellule 33: fasc. 1, 



p. 299; Col. PL IX and PI. XV, fig. 88. 1923. Also Thom, The 



Penicillia, pp. 199-200. 1930. 



Colonies on Czapek's solution agar growing restrictedly, attaining a 

 diameter of 2.0 to 3.0 cm. in 12 to 14 days at room temperature, strongly 

 wrinkled and buckled, with center lunbonate in some colonies, depressed 

 in others (fig. 60 A), consisting of a tough mycelial felt 100 to 200^1 or more 

 deep but thinning to a fibrous margin, in most strains conspicuously yellow 

 in color, near citrine to pinard yellow (Ridgway, PL IV), and showing very 

 little conidial development up to 2 weeks or more, in other strains sporu- 

 lating less tardily and becoming dull gray near mineral to court gray 

 (R., PL XLVII) in about 10 to 14 days, with surface appearing velvety 

 or very lightly floccose, vegetative hyphae delicate and yellow in color; 

 exudate not produced in some strains, limited in others, in light citrine 

 shades; odor slight, moldy; reverse and agar in bright yellow shades dur- 

 ing the growing period, in some strains becoming darker in age; conidio- 



