Orange Sea Lichen 
Orange Waxcap 
Orange webcap 
Orange-cored Shadow Lichen 
Orange-latex Milky 
Ornate-stalked bolete 
Osmoporus odoratus 
Otidea alutacea 
Otidea unicisa 
oudemansiella canari 
Oudemansiella gigaspora 
Overflowing Slimy Stem 
Oxyporus populinus 
Oyster mushroom 
Pagoda Fungus 
Painted Suillus 
Pale Bramble Rust 
Pale Brittlestem 
Pale-yellow splash tooth 
Panaeolina foenisecii 
Panellus luxfilamentus 
Panellus pusillus 
Pannaria taveresii 
Panus lecomtei