Aborted entoloma 
Acarospora fuscata 
Admirable bolete 
Agaricus andrewii 
Agaricus moelleri 
Agrocybe praecox 
Alder Scalycap 
Alectoria sarmentosa 
Amanita ananiceps 
Amanita atkinsoniana 
Amanita calyptroderma 
Amanita daucipes 
Amanita fulva 
Amanita Pseudovolvata 
Amanita punctata 
Amanita texasorora 
Amanita velatipes 
Amauroderma rude 
American Abrupt-Bulbed Lepidella 
American Anzia Lichen 
American Cauliflower Mushroom 
American Eastern Yellow Fly Agaric 
American Orange-Brown Ringless Amanita 
Amethyst Deceiver