Diced potatoes 240 g
Distilled water 1000 ml
Boil until cooked soft. Decant the clear liquid
and add water to 1 litre.
Decanted liquid 1000 ml
Malt extract 5 g
Agar 15 g
Heat for 30 min. and then autoclave at 121 °C for
20 min. Put stripes or squares of sterile white
blotting paper on the surface of the sterilized
media in Petri plates. In test tubes the stripes
are added prior to autoclaving.