Cortinarius incognitus 
Cortinarius kula 
Cortinarius marylandensis 
Cortinarius muscigenus 
Cortinarius mutabilis 
Cortinarius persplendidus 
Cortinarius phalarus 
Cortinarius pluvius 
Cortinarius seidliae 
cortinarius semisanguineus 
Cortinarius sinapicolor 
Cortinarius vanduzerensis 
Cortinarius violaceus 
Cotylidia diaphana 
Cracked Cap Polypore 
Crimped Gill 
Crimson Waxcap 
Crinipellis setipes 
Cross-veined Troop Mushroom 
Crowded White Clitocybe 
Crown-Tipped Coral Fungus 
Crusty Russula 
Cryptic bonnet 
Cryptoporus volvatus