Pseudoplectania vogesiaca 
Psilolechia lucida 
Punctelia rudecta 
Punctelia subrudecta 
Purpureocillium atypicola 
Pyronema omphalodes 
Pyrrhospora varians 
Pyxine sorediata 
Ramalina sinensis 
Red blotch 
Red Dock Spot 
Reindeer Lichen 
Reindeer Lichen 
Rhizocarpon geographicum 
Rhizoplaca chrysoleuca 
Rhytisma prini 
Rock Foam Lichen 
Rock-loving Cladonia 
Romjularia lurida 
Ropalospora viridis 
Rosellinia subiculata 
Rosette Pixie-cup Lichen 
Rosy Saucer Lichen 
Saccharomyces cerevisiae