POTATO AGAR 121 



Medium 70 



Agar for Soil Fungi 



Agar 15.0 gm. 



Dibasic potassium phosphate (K 2 HPO 4 ) 0.5 gm. 



Magnesium sulphate (MgSCU + 7H 2 O) 0.2 gm. 



Dextrose (C 6 Hi 2 O 6 ) 10.0 gm. 



Soil extract 200.0 c.c. 



Water 800.0 c.c. 



Jensen, C. N., Bui. 315, Cornell Agr. Exp. Sta., p. 430, 1912. 



Medium 71 

 Solution for Fungi 



Dibasic potassium phosphate (K 2 HPO4) i.o gm. 



Magnesium sulphate (MgSO4 + 7H 2 O) 0.5 gm. 



Potassium chlorid (KC1) 0.5 gm. 



Ferrous sulphate (FeSC>4 + 7H 2 O) o.oi gm. 



Sodium nitrate (NaNOs) 2.0 gm. 



Cane-sugar (Ci 2 HaOu) 30.0 gm. 



Distilled water. . . 1000.0 c.c. 



Medium 72 

 Potato Agar 



Potato 200 gm. 



Agar 30 gm. 



Dextrose (C 6 Hi 2 O 6 ) 20 gm. 



Distilled water. . . 1000 c.c. 



Peel and slice 200 grams of potatoes. Cook in 1000 c.c. 

 water for one hour in the steamer. Strain or decant the 

 clear liquid and restore it to original volume. Add 20 

 grams glucose and 30 grams agar. Heat in steamer until 

 the agar is dissolved. Filter through cotton filter. 



