Aborted entoloma 
Admirable bolete 
Agaricus andrewii 
Agaricus auricolor 
Agaricus austrovinaceus 
Agaricus deardorffensis 
Agaricus moelleri 
Agaricus vinosobrunneofumidus 
Agrocybe erebia 
Agrocybe firma 
Agrocybe paludosa 
Agrocybe praecox 
Agrocybe putaminum 
Alder Scalycap 
Aleurodiscus disciformis 
Almond Mushroom 
Amanita americitrina 
Amanita ananiceps 
Amanita aprica 
Amanita atkinsoniana 
Amanita augusta 
Amanita battarrae 
Amanita brunneibulbosa 
Amanita calyptroderma