Fusion products between compatible and incompatible species were obtained by protoplast fusion. The somatic hybrids of inter compatible species formed heterokaryons, while somatic hybrids of inter incompatible species formed synkaryons that retained genes from both parents. Fruit body development of synkaryons was influenced by several factors including light, temperature, nutritions, and physical states of the culture media. Clamp connections were present in most of mature fruit bodies though initial fusion colonies were lack. The synkaryons showed unique patterns compared with heterokaryons such as slow growth rate, clamp connection formation at mitosis, and asynchronous fruiting body. Four possible genotypes that were prototrophs, auxotroph of one parental type, auxotroph of the other parental type, and auxotrophic recombinants can be generated from progenies of somatic hybrids. Some synkaryons recovered non expected alleles, indicating that macrogenome was integrated into the random site of receipient chromosomes after genome reassortment.