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Abstract
Melanotus textilis (Strophariaceae), a small saprobic agaric, exhibits a bifactorial (tetrapolar) mating system based on the formation of clamp connections. The mating system is the same as that of M. defraudatus but differs from that of M. hartiae, which is unifactorial (bipolar). Matings from different populations of M. textilis show that the locus controlling mating compatibility is multiallelic. Asexual reproduction by arthroconidia was also observed.