224 
Journal of Agricultural Research 
Vol. XXI, No. 4 
SUMMARY 
(1) The following fungi can utilize glucose as a source of carbon: 
Fusarium acuminatum , Sclerotium bataticola, Diplodia tubericola, Pen - 
icillium sp., Mucor racemosus, Botrytis cinerea, and Rhizopus tritici. 
(2) Penicillium sp., Botrytis cinerea , and Sclerotium bataticola pro¬ 
duced a maximum of a little more than 2 gm. of C0 2 in a single day. 
The other fungi formed a relatively small amount. The organisms 
which grew rapidly produced a comparatively small amount of C0 2 and 
reached their maximum in a short time after the culture flasks were 
inoculated. In all cases the respiration was measured as long as C 0 2 
was given off in any measureable quantity. 
(3) The three fungi, Penicillium sp., Botrytis cinerea , and Sclerotium 
bataticola , which grew slowly, produced a relatively large amount of dry 
material and consumed all or nearly all of the glucose. The reverse is 
true of the other organisms. 
(4) The quantity of C 0 2 evolved does not necessarily correlate with 
the amount of dry material formed or with the amount of glucose re¬ 
duced. Some organisms ( Mucor racemosus and Fusarium acuminatum) 
which produced a comparatively small quantity of dry material reduced 
a large amount of sugar. 
(5) Three organisms evolved more than 1 gm. of C0 2 , the others con¬ 
siderably less, for each gram of glucose reduced. 
(6) The dry weight of material per gram 01 glucose consumed is in all 
cases considerably less than unity. 
(7) The “coefficient of respiration” varies from 0.83 to 2.01, the 
“economic coefficient” from 3.86 to 22.86. The “economic coefficients” 
of Fusarium acuminatum and Mucor racemosus (17.11 and 22,86, respec¬ 
tively) are several times higher than that of any of the other fungi studied. 
They are also higher than the values given by other investigators. 
(8) The quantity of C 0 2 evolved was not equivalent to the theoretical 
amount that might have been produced from the sugar consumed. 
Other investigators have shown that alcohol is formed by Mucor racemo¬ 
sus , but the writers have demonstrated for the first time that it is 
produced by Fusarium acuminatum , Rhizopus tritici , and Diplodia 
tubericola . It was previously shown by the writers that these same 
organisms when growing in a 10 per cent solution of glucose increase 
the acidity of the solution. It is therefore probable that some of the 
glucose was utilized in the production of alcohol and acids. 
