YMS

From ActinoBase

Yeast extract: 4.0 g Malt extract: 10.0 g Soluble starch: 4.0 g (or sometimes as high as 30.0 g) Agar: 20.0 g (for solid medium) Calcium carbonate: 2.0 g (often added after adjusting pH) Distilled water: 1000 mL