Rhubarb bolete 
Rhytisma prini 
Rickenella mellea 
Rickenella swartzii 
Ridged tooth 
Rigidoporus laetus 
Ringless Honey Mushroom 
Ringless Panther 
Rock Foam Lichen 
Rock-loving Cladonia 
Romjularia lurida 
Roody's Bolete 
Roosevelt Ringless Amanita 
Rooting Polypore 
Ropalospora viridis 
Rose-Tinted Amanita 
Rosellinia subiculata 
Rosette Pixie-cup Lichen 
Rosy bonnet 
Rosy Conk 
Rosy Conk 
Rosy crust fungus 
Rosy Earthstar 
Rosy parachute