Fig. 5: Current model of the life cycle of Amanita phalloides, illustrating a bisexual reproductive cycle (left) and a unisexual reproductive cycle (right).
From: Invasive Californian death caps develop mushrooms unisexually and bisexually

M marks meiosis. Following meiosis, the single nucleus of each spore undergoes a mitotic division and so each spore carries two (genetically identical) nuclei.