Knudson C (Arditti, 1982)

Originally cited by Arditti, 1982. Introduction, North American  Terrestrial Orchids, etc. In Orchid Biology II. Reviews and Perspectives. Orchid seed germination and seedling culture- a manual,  ed. J. Arditti, pp. 245-73, 278-93. Ithaca, New York: Cornell University Press.

Ca(NO3)2 * 4 H2O  1000 mg  KH2PO4  228 mg  K2HPO4  7.8 mg  MgSO4 * 7 H2O  250 mg  (NH4)2SO4  500 mg  FeSO4 * 7 H2O  25 mg  MnSO4 * 4 H2O  7.5 mg  CuSO4  0.040 mg  H3BO3  0.056 mg  MoO3  0.016 mg  ZnSO4  0.331 mg  Ripe banana  100-150 g  Vegetable charcoal (Nuchar C)  2 g  Sucrose  20 g  Agar  12-15 g

Note: This medium does not employ the use of chelated iron,  resulting in an iron-poor medium. The addition of EDTA-chelated iron is recommended.

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