Conditions for fruitbody formation by the white rot fungus Pycnoporus cinnabarinus in vitro were outlined. A marked difference in substrate requirements in comparison to previously tested brown rot fungi was revealed. Agar media containing Walseth cellulose and NH4 tartrate at 1 g/l permit profound production of basidiospores particularly at 15°C but only under light treatment. Higher NH4 tartrate concentrations and glucose addition slowed down or inhibited the fruitbody formation. Axenic basidiospores, to be used in tests for inhibitors contributing to natural durability, as well as in tests for fungicides could thus be produced.

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