Caesar's mushroom 
Calcareous Rimmed Lichen 
Callistosporium luteo-olivaceum 
Caloboletus frustosus 
Caloboletus inedulis 
Caloplaca aurantia 
Caloplaca cerina 
Caloplaca erythrocarpa 
Caloplaca flavovirescens 
Caloplaca ignea 
Caloplaca ochracea 
Calostoma fuscum 
Calostoma ravenelii 
Calostoma rodwayi 
Camillea punctulata 
Campanella junghuhnii 
Campanella tristis 
Candelaria concolor 
Candlesnuff fungus 
Candy Cap 
Cannon Ball fungus 
Canoparmelia caroliniana 
Cantharellus alborufescens 
Cantharellus confluens