Aborted entoloma 
Acarospora fuscata 
Acarospora radicata 
Admirable bolete 
Aesculus Leaf Blotch 
Agaricus andrewii 
Agaricus auricolor 
Agaricus austrovinaceus 
Agaricus deardorffensis 
Agaricus moelleri 
Agaricus vinosobrunneofumidus 
Agrocybe erebia 
Agrocybe firma 
Agrocybe paludosa 
Agrocybe praecox 
Agrocybe putaminum 
Akanthomyces aculeatus 
Akanthomyces aranearum 
Alder Scalycap 
Alectoria sarmentosa 
Aleurodiscus disciformis 
Almond Mushroom 
Alyxoria varia 
Amanita americitrina