Clades:
Polyporomycetes;
Basidiomycota;
Fungi;
Plants.
Members: 1 family; 15 genera; 105 species.Families
Hydnodontaceae: Aegeritina, Brevicellicium, Dextrinocystis, Dextrinodontia, Fibriciellum, Litschauerella, Luellia, Porpomyces, Sistotremella, Sphaerobasidium, Subulicystidium, Trechispora, Tubulicium.
Uncertain: Brevicellopsis, Sistotremastrum.