Golovinomyces magnicellulatus 
Golubkovia 
Granular Rosette Lichen 
Graphis mucronata 
Gray Reindeer Lichen 
Green Beetle Hanger 
Green Reindeer Lichen 
Green Rock-Posy 
Green Wood Cup 
Grey disco 
Gyalolechia flavovirescens 
Gyromitra ancilis 
Gyromitra californica 
Gyromitra olympiana 
Hairy Earthtongue 
Hare's Ear 
Helminthosphaeria clavariarum 
Helvella compressa 
Helvella ephippium 
Helvella lactea 
Helvella latispora 
Helvella macropus 
Helvella maculata 
Hesperomyces harmoniae