Aborted entoloma 
Agaricus andrewii 
Agaricus moelleri 
Agrocybe praecox 
Alder Scalycap 
Amanita ananiceps 
Amanita atkinsoniana 
Amanita calyptroderma 
Amanita daucipes 
Amanita fulva 
Amanita Pseudovolvata 
Amanita punctata 
Amanita texasorora 
Amanita velatipes 
American Abrupt-Bulbed Lepidella 
American Eastern Yellow Fly Agaric 
American Orange-Brown Ringless Amanita 
Amethyst Deceiver 
Angel wing 
Anthracophyllum archeri 
Armillaria gallica 
Armillaria nabsnona 
Armillaria sinapina 
Arrhenia hohensis