Macbrideola, Macrocystidia, Macrolepiota, Macroscyphus, Macrotyphula, Mamiana, Marasmiellus, Marasmius, Marcelleinia, Martellia, Martininia, Massaria, Massariella, Massarina, Megacollybia, Megalocystidium, Melampsora, Melanconiella, Melanconis, Melanconium, Melanogaster, Melanoleuca, Melanomma, Melanophyllum, Melanopsamma, Melanospora, Melastiza, Meliola, Melitiosporium, Melitosporella, Melittosporium, Melogramma, Melomastia, Melzericium, Membranomyces, Meripilus, Merismodes, Merulicium, Meruliopsis, Merulius, Metacapnodium, Metatrichia, Metulodontia, Micraspis, Microascus, Microglossum, Micromphale, Micropeziza , Actinopeziza), Microscypha, Microsphaera, Microstoma, Microthyrium, Miladina, Minakatella, Mitrophora, Mitrula, Mniaecia, Mollisia, Mollisina, Mollisiopsis, Monascostroma, Monilinia, Montagnea, Morchella, Morenoina, Morganella, Mucilago, Mucronella, Mullerella, Mutinus, Mycena, Mycenastrum, Mycenella, Mycoacia, Mycoaciella, Mycobilimbia, Mycocalia, Mycogloea, Mycomelaspilea, Mycorrhaphium, Mycosphaerella, Mycostigma, Myriangium, Myriostoma, Mytilidion, Myxarium, Myxomphalia, Myxomphalina