W2 medium

For symbiotic cultures.

Ca(NO3) 2 * 4 H2O  200 mg  KCl  100 mg  KH2PO4  200 mg  MgSO4 * 7 H2O  100 mg  Yeast extract (Difco)  100 mg  Glucose  2 g  Finely granulated (<2 mm) decayed wood  3 g  Agar  12 g

Source: Rasmussen, H. Terrestrial orchids from seed to mycotrophic plant. Cambridge University Press, Cambridge. 1995.