Hapalopilus nidulans – synoniem of Hapalopilus rutilans
Helvella leucopus – synoniem of Helvella spadicea
Hericium clathroides – synoniem of Hericium coralloides
Heteroporus biennis – synoniem of Abortiporus biennis
Hygrocybe sciophana – synoniem of Hygrocybe perplexa
Hygrophorus dichrous – synoniem of Hygrophorus persoonii
Hymenoscyphus conscriptus – synoniem of Hymenoscyphus salicinus
Hymenoscyphus herbarum – synoniem of Calycina herbarum
Hyphoderma radula – synoniem of Basidioradulum radula
Hyphoderma sambuci – synoniem of Rogersella sambuci
Hypholoma capnoides – synoniem of Psilocybe capnoides
Hypholoma elongatipes – synoniem of Psilocybe elongata
Hypholoma fascicularis – synoniem of Psilocybe fascicularis
Hypholoma sublateritium – synoniem of Psilocybe sublateritia
Hypomyces chrysospermus – synoniem of Sepedonium chrysospermum