IIi4 STORRS AGRICULTURAL EXPERIMENT STATION. 
9. Roguefort Cheese.—In the ripening of Roquefort cheese 
the only organisms found necessary are lactic bacteria and the 
Roquefort species of Penicillium. 
10. ‘The Roquefort Penicillium has been shown to possess 
the power to reduce the acidity, to change the chemical nature 
of the curd, and to produce the typical flavor. 
11. Other Varieties of Cheese.—The Roquefort species of 
Penicillium is found to be present in the imported Stilton, 
Gorgonzola and Brinse, as well as Roquefort cheese. 
12. Oidium lactis alone of the forms studied has been found 
upon the various brands of Limburger, Brie (American type), 
Isigny and related cheeses found in the market. Other species 
incidentally occur but not uniformly; and such occurrence is 
avoided as far as possible by the makers. 
Fig. 1.—Camembert Penicillium (P. camemberti): 
a, conidiophore showing a common type of branching and the produc- 
tion of basidia and conidia, highly magnified. } 
6, acommon form showing much less branching. 
c, ad, f, diagrams of large fructifications (x 80). 
g,7,%, germinating conidia. 
’ 
Fig. 2.—Roquefort Penicillium (P. roqueforti) : 
a, part of conidiophore and base of fructification highly magnified show- 
ing the production of basidia on the sides as well as at the apex of 
the basidiophore. 
6, c, other types of branching. 
d, young conidiophore just branching. 
e, f, basidia and the formation of conidia, highly magnified. 
g,h, 7, diagrams of types of fructification,as seen under low power (x 
30). 
k, 1, m,n, germination of conidia and new conidia produced directly 
on the first hyphae. 
Fig. 3.—Oidium Lactis: 
a, 6, dichotomous branching of growing hyphae. 
,d,g, simple chains of oidia breaking through substratum at dotted 
line xy, dotted portions submerged. 
e, f, chains of oidia from a branching outgrowth of a submerged cell. 
h, branching chain of oidia. 
kh, 1, m,n, 0, p, s, types of germination of oidia under varying condi- 
tions. ; 
C 
t, diagram of a portion of a colony showing habit or oidium lactis as 
seen in culture media. 

