:--' 486 A MANUAL of the! penicillia 



NRRL 1160 and 1161 isolated from agar plates exposed in a meat-packing 

 plant and sent to us in 1937 by Dr. G. A. Ledingham, Ottawa, Canada. 

 Strain NRRL 965 received from the Thorn Collection (No. 4733.125) "as 

 Biourge's culture of Penicillium verrucosum Dierckx is believed to be :| 

 properly assigned here. NRRL 958 received in 1927 from Professor F. D. 

 Heald, Pullman, Washington, is also representative of this species in the 

 broad sense of this Manual. This latter strain produces colonies that are 

 conspicuously zonate and approach the "blue-green series," as typified by 

 P. cydo'pium, but remain conspicuously green in age. 



Penicilliurn miisae Weidemann (Centbl. f . Bakt. etc., (II) 19: 687-689, fig. 3. 1907), 

 isolated from yellow-brown to olive-brown patches on a banana, was described in 

 terms which indicate its relationships with P. viridicatum Westling, particularly in 

 the yellow-green color of its conidia and in the branching habit of the penicillus de- 

 scribed. Vegetative hyphae were reported as 2.5)u in diameter, which is considerably 

 less than in most members of the series. Conidia were described as elliptical to sub- 

 globose and to measure about 2.2 to 2.8 by 2.0 to 2.3m, or to be appreciably smaller 

 than in the strains examined by us. Although the strain originally observed ob- 

 viously represented a comparatively delicate form, we believe the species probably 

 should be regarded as a synonym of the generally accepted species P. viridicatum 

 Westling. 



Penicillium stephaniae Zaleski (Bui. Acad. Polonaise Sci.: Math, et Nat. Ser. B, 

 pp. 451-452; Taf. 40. 1927) was based upon a strain isolated from soil in Poland. 

 The type was received from the Centraalbureau in 1928 and studied by Thorn, who, 

 in his Monograph (1930), confirmed Zaleski 's general observations regarding it. Both 

 the original description and Thorn's notes, subsequently made, point to inclusion in 

 the P. viridicatum series. In the absence of the type or other authentic material for 

 comparison in the present study, specific assignment to P. viridicatum Westling or 

 P. olivino-viride Biourge is not recommended, but we question whether adequate 

 bases exist for retention of P. stephaniae as a separate species. 



Penicillium verrucosum Dierckx (Soc. Scien. Brux. 25: 88. 1901. See also Biourge, 

 Monograph, La Cellule 33: 123-126, Col. PI. I, PI. II, fig. 7. 1923) has been commonly 

 interpreted as representing a member of the P. viridicatum scries which shows conidial 

 structures with conidiophores and branches conspicuously roughened. Since this 

 character varies markedly in different members of the series, and since it differs 

 greatly in the same strain depending upon the substratum employed, a species based 

 primarily upon this character is of questionable validity. Culture NRRL 965, from 

 the Thom Collection as No. 4733.125 representing Biourge's culture of P. verrucosum 

 differs little from other strains regarded by us as P. viridicatum, whereas a strain 

 received from the Centraalbureau in May 1946, and presumably identical as to source, 

 should more properly be assigned to the P. cyclopium series. The name P. verrucosum 

 should, we believe, be dropped. 



Penicillium blakesleei Zaleski (Bui. Acad. Polonaise Sci.: Math, et Nat. Ser. B, 

 pp. 441-444, Taf. 36. 1927) as received and studied by Thom (1930) represented a 

 mixture of two molds, one white or nearly so, the other green and conforming fairly 

 closely to Westling's P. viridicatum. Assuming that the latter culture represented 

 Zaleski's species, P. blakesleei may be regarded as belonging to the series under dis- 



