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ABSTRACT
Monokaryotic and dikaryotic mycelial cultures of Panellus stypticus are bioluminescent when grown on solid medium. Fruiting body primordia on fallen hardwood have minimal bioluminescence (≤1 × 108 photons emitted per second per primordium). Bioluminescence emission was observed to increase 10- to 50-fold during basidiocarp development. Distribution of bioluminescent tissues in the mature fruiting body is not uniform, but is restricted to the edge of radial and transverse lamellae, junction of lamellae with stipe and pileus margin. Distribution of bioluminescence along the lamellar edge corresponds to the position of cheilocystidia. Less than 10% of the light is emitted by other tissues in young and mature basidiocarps, including fertile hymenial tissues and stipe. In senescent basidiocarps, appreciable luminescence is detectable from the pileus surface (30–60% of that observed from the hymenophore).