Low-level bioluminescence detected in Mycena haematopus basidiocarps

Bioluminescence has been reported to occur in approximately 40 species of fungi (see Was- sink, 1948,1978, 1979), nearly two thirds of which are members of Mycena. Luminescence, varying among species, occurs in either the basidiocarp, the mycelium, the spores, or in combinations thereof (see O'Kane et al., 1990). Photometers have long been used to study bioluminescence (see Reynolds, 1972); however, perception of luminescence in fungi has been largely by eye and/ or documented photographically. Use of photometric measurements has generally been restricted to physiological studies of common species and examinations of the possible occurrence of bioluminescence in species suggested to be luminous (e.g., Bermudes et al., 1990). Knowledge of the distribution of fungal luminescence, therefore, has been generally restricted by the detection limits of the human eye.