The taxonomy and biology of Myeena citricolor (Berk. and Curt.) Sacco is reviewed and techniques of induction of basidiocarps by certain other fungi ar~described.-M ycena cltricolor was induced to produce the perfect stage when grown in co-culture with Penicillium oxalicum, P. paUeans, P. cyclopium, P. breoi-compectum, or P. viridicatum. Basidiocarp yield was highest when M. citricolor was grown in co-culture with .P. oxalicum. A low percentage of field isolates or M. citricolor were able to produce some basidiocarps in mono-culture, but yield was greatly increased when this fungus was grown in co-culture with P. oxalicum. Other isolates of M. cltricolor produced basidiocarps only when grown in co-culmte with P. oxelicum. However, several other basidiomycetes failed to produce the perfect stage when grow in co-culture with P. oxalicum, A basidiocarp-stimulating substance(s) (BSS) was present in sterile supernatant fluids from cultures of Penicillium oxalicum, BSS resisted autoclaving and readily passed through dialysis tubing. Yield of BSS was highest whenP. oxalicum was cultured in potatodextrose broth (PDB) or Emerson's YpSs medium in still culture for 1 week under laboratory conditions. P. oxaUcum grown in PDB ,produced BSS independently of light conditions, but M. cit~icolo~produced basidiocarps in response to BSS (or in co-culture with P. oxalicum) only when grown in alternating periods of light and ,dark. M. citricolor produced basidiocarps only when it was cultured on natural or semi-synthetic media.
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