400 A ]\L\NUAL OF THE PENICILLIA 



mold by Dierckx's description. The species name may better be dropped because 

 the author failed to describe his material properly. 



Penicillium atro-viridum Sopp, in Monogr. pp. 149-150, Taf. XVI, fig. 114; Taf. 

 XXIII (XXII corrected) fig. 12. 1912. Sopp's specific name was apparently offered 

 independently of P. atro-viride Dierckx (1901). It is probably based upon one of the 

 P. roqueforli series producing very dark conidial areas and very dark greenish black 

 reverse. Sterigmata were reported as large, flask-shaped, and to produce globose or 

 angular conidia 4.0 to 6.0m in diameter. His culture has not been seen by anyone else. 



Penicillium vesiculosum Bainier, in Bui. Soc. Mycol. France 23: 10-12, PI. II, figs. 

 1-8. 1907. Bainier described a strain with all cells swollen and containing large 

 vacuoles in the mycelium, conidiophores, and penicilli. The structures reported and 

 illustrated were obviously pathological. Occasional strains of the P. roqueforli series 

 show structures resembling those described. We believe his species to have been 

 based upon such a strain. 



Penicillium aromaticum ("Gammelost") Sopp, in Monogr., pp. 159-161, Taf. XVII, 

 fig. 123; Taf. XXII, fig. 10. 1912. Sopp offered this as a change of name for P. 

 arom.aticum II, a yellow-green mold included in his earlier discussion of cheese molds 

 (Centbl. f. Bakt. etc. (II) 4: 161-169. 1898). In spite of his statement that this was 

 different from the Roquefort culture, no data were given which would remove it from 

 the P. roqueforli series. Sopp did not distribute cultures and his species is known by 

 description only. 



Penicillium, gorgonzola Weidemann, in Biourge, Monogr., La Cellule 33: fasc. 1, 

 pp. 204-206; Col. PI. V and PI. VIII, fig. 43. 1923. Biourge identifies this species 

 with P. roqueforli var. weidemanni Westling (see above), hence assignment of the 

 name appears to be arbitrary. Biourge reported that his culture grew poorly upon 

 potato in contrast to good growth of P. roqueforli. Reporting on the same culture, 

 Thom (1930) described colonies as broadly spreading, velvety, 200 to 300m deep with 

 uneven arachnoid margin, conidial areas in pale bluish then bluish green, reverse 

 uncolored, with conidiophores short and roughened, conidia subglobose, about 4.0 

 to 5.5m in diameter. Current examination of Biourge's strain, NRRL 857, in general 

 confirms Thom's observation and fails to show sufficient bases for separation as either 

 a species or variety. No significant relation to Gorgonzola cheese was claimed. 



Penicillium stilton Biourge, in Monogr., La Cellule 33: fasc. 1, pp. 206-207; Col. 

 PI. V and PI. VII, fig. 42. 1923. Biourge, with only a few strains in the group before 

 him, applied this name to one isolated from Stilton cheese, a cheese of the Roquefort 

 type made from cow's milk and taking its name from the town of Stilton, England. 

 Colonies of Biourge's culture growing upon Czapek's agar showed more floccosity, 

 less green color due to reduced conidium production, and little or no color in reverse. 

 It grew poorly on potato. Among the multitude of variants seen within the series, 

 forms which seemed to reproduce this characterization closely have been seen occa- 

 sionally; but intermediate forms are too commonplace to justify maintaining P. stil- 

 ton as a separate species. 



Penicillium suavolens Biourge (Monogr., La Cellule 33: fasc. 1, pp. 200-202; Col. 

 PI. V and PI. VIII, fig. 4. 1923) as known from the original description and from 

 Biourge's culture sent to Thom in 1924, represents a member of the P. roqueforli series 

 characterized principally by the production of paler green colors, shorter conidio- 



