Cortinarius violaceus 
Cotylidia diaphana 
Crabseye Lichen 
Cracked Cap Polypore 
Crescent Map Lichen 
Crimped Gill 
Crimson cup 
Crimson Waxcap 
Crinipellis setipes 
Crinkled Snow Lichen 
Crocicreas coronatum 
Cross-veined Troop Mushroom 
Crowded White Clitocybe 
Crown-Tipped Coral Fungus 
Crumpled Rag Lichen 
Crusty Russula 
Cryptic bonnet 
Cryptoporus volvatus 
Cryptothecia rubrocincta 
Crystal Brain Fungus 
Cudonia circinans 
Cuphophyllus borealis 
Curled Snow Lichen 
Curry Milkcap