426 A MANUAL OF THE PENICILLIA 



Penicillium camemherti Thorn, in U. S. Dept. Agr,, Bur. Anim. Ind., Bui. 

 82, p. 33, fig. 1. 1906; Ibid., Bui. 110, p. 50, fig. 16. 1910; The 



Penicmia,.pp. 312-313, fig. 44B. 1930. 

 Synonyms: P. camemhert Sopp, in Monograph pp. 179-180, Taf. XIX, 

 fig. 134 and Taf. XXIII, fig. 17-18. 1912. 

 P. aromaticum III Sopp, in Centbl. f. Bakt. etc. II, 4: 

 161-169. 1898; cited in Sopp's Monograph, p. 179, 

 1912, without description but as synonym of P. camem- 

 hert Sopp. 



Colonies on Czapek's solution agar (Col. PI. VII) growing more or less 

 restrictedly, about 2-3 cm. in 10 days to two weeks at room temperature, 

 loose-textured, floccose, cottony (fig. HOC), pure white at first, changing 

 to pale gray-green near glaucous to greenish glaucous (Ridgway, PI. XLI) 

 after 7 to 8 days, deeply lanose throughout, hyphae not tending to form 

 ropes or fascicles; reverse uncolored or in cream to very pale yellow shades; 

 odor pronounced, simulating that of potato peels; exudate not produced, 

 or present as scattered, small, uncolored droplets largely submerged in the 

 mycelial mass; penicilli fairly abundant, asymmetric, with conidial chains 

 forming an irregular, tangled mass, commonly measuring from 50 to 80/x 

 in length, but with individual structures ranging from 30 to 100^ in length, 

 borne upon long conidiophores arising from the substratum or upon short 

 branches from aerial hyphae; conidiophores more or less tangled, extremely 

 variable in length, ranging from 250 to 600/i by 2.5 to 3.5/x when arising 

 from the substratum, 40 to 200m in length when borne on aerial hyphae, 

 with walls of conidiophores and fruiting branches commonly slightly 

 roughened; spore-bearing apparatus ranging from 25.0 to 50.0m in length, 

 irregularly branched, with branches and metulae often poorly differen- 

 tiated; branches commonly 12.0 to 18.0m by 2.2 to 3.4m; metulae borne at 

 different levels in the penicillus and usually in groups of 2 or 3, ranging in 

 size from 9 to 14m by 2.2 to 3.2m; sterigmata in groups of 2 to 5, rarely 

 more, 9.0 to 14.0m by 2.2 to 2.8m; conidia elliptical when first formed, be- 

 coming subglobose at maturity, commonly measuring 3.5 to 5.0m by 3.0 

 to 4.5m, smooth-walled, lightly colored in mass. 



Colonies on steep agar essentially as on Czapek but growing somewhat 

 more rapidly and somewhat heavier sporing; conidiophores commonly 

 measuring 1 mm. in length and penicilli slightly larger than described 

 above. 



Colonies on malt extract agar growing more rapidly, up to 5.0 cm. in 

 10 days to 2 weeks (fig. HOD), looser textured and appearing coarser in 

 gross colony aspect; conidiophores up to 2 mm. in length; penicilli averag- 

 ing somewhat larger than on Czapek, commonly 50 to 60m or more in 



