Buttery Collybia 
Caesar's mushroom 
Callistosporium luteo-olivaceum 
Campanella junghuhnii 
Campanella tristis 
cat dapperling 
Charbonnier 
Charcoal Psathyrella 
Cheimonophyllum candidissimum 
Chlorophyllum hortense 
Chlorophyllum olivieri 
Chromosera cyanophylla 
Chrysomphalina aurantiaca 
Chrysomphalina grossula 
Cinnabar Oysterling 
Cinnamon Webcap 
Clarkeinda trachodes 
Clavaria argillacea 
Clavulinopsis aurantiocinnabarina 
Clavulinopsis corniculata 
Clitocybe albirhiza 
Clitocybe albofragrans 
Clitocybe americana 
Clitocybe diatreta