Lyophyllum littoralis 
Macrocystidia cucumis 
Macrolepiota excoriata 
Macrolepiota macilenta 
Magpie Inkcap 
Mallow Rust 
Marasmiellus pluvius 
Marasmiellus praeacutus 
Marasmius alveolaris 
Marasmius armeniacus 
Marasmius capillaris 
Marasmius crinis-equi 
Marasmius lachnophyllus 
Marasmius plicatulus 
Marasmius purpureostriatus 
Marasmius strictipes 
Marasmius sullivantii 
Marsh Webcap 
Marshmallow bolete 
Marshmallow Polypore 
Matte Jack 
Mauve Bonnet 
Mauve Splitting Waxcap 
Mayapple Rust