Fabraea rhytismoidea 
Fairy Pins 
Fairy's barf lichen 
False Morel 
Farinose Cartilage Lichen 
Flavoparmelia rutidota 
Flexible Helvella 
Fluffy Dust Lichen 
Fly-Speck Leaf Spot 
Fusarium merismoides 
Fuscopannaria leucostictoides 
Fuscopannaria subimmixta 
Fusicolla merismoides 
Fuzzy Reindeer Lichen 
Geopyxis carbonaria 
Gibellula pulchra 
Glasscup 
Globe Ball Lichen 
Gold cobblestone lichen 
Golden Canker, Pagoda Dogwood Decline 
Golden Cobblestone Lichen 
Golden Moonglow Lichen 
Golden Soot Lichen 
Golden-eye Lichen