Abortiporus, Abrothallus, Acanthobasidium, Acanthonitschkia, Acanthophiobolus, Achroomyces, Acrospermum, Actidium, Actiniopsis, Adustomyces, Agaricus, Agrocybe, Agyrium, Albatrellus, Aleuria, Aleurocystidiellum, Aleurodiscus, Allescheria, Alpova, Alternaria, Amanita, Amaurochaete, Ampelomyces, Amphinema, Amphisphaerella, Amphisphaeria, Amyloathelia, Amylocorticium, Amylocystis, Amylostereum, Anisogramma, Anisostomula, Anixiopsis, Anomoporia, Anthostoma, Anthostomella, Anthracobia, Anthurus, Antrodia, Antrodiella, Aphanobasidium, Apiocrea, Apioporthe, Apiosordaria, Apiospora, Apodospora, Aporpium, Apostemidium, Appendiculella, Apriorhynchostoma, Arachnion, Arachnocrea, Arachnopeziza, Arachnoscypha, Arcangeliella, Arcticomyces, Arcyodes, Arcyria, Arcyriatella, Armillaria, Arnium, Arrhenia, Arthynium, Artomyces, Arwidssonia (Sphaeropeziza), Ascobolus, Ascocalyx, Ascocorticum, Ascocoryne, Ascodiachena, Ascotremella, Ascotricha, Asczonus, Aseroë, Aspergillus, Asterina, Asterodon, Asteromassaria, Asterosphora, Asterostroma, Astraeus, Astrosphaeriella, Athelia, Athelidium, Athelopsis, Atichia, Atopospora, Aulographum, Aurantioporus, Aureoboletus, Auricularia, Auriculariopsis, Auriporia, Auriscalpium