{{Taxobox | image = | image_caption = | regnum = Fungi | divisio = Ascomycota | classis = Pezizomycetes | ordo = Pezizales | familia = Pyronemataceae | genus = Hydnocystis | genus_authority = Tul. (1844) | type_species = Hydnocystis arenaria | type_species_authority = Tul. & C.Tul. (1844) | subdivision_ranks = Species | subdivision = H. arenaria H. beccarii H. californica H. clausa H. convoluta H. echinospora H. japonica H. piligera H. singeri }}
Hydnocystis is a genus of truffle-like fungi in the family Pyronemataceae.
{{Taxonbar|from=Q5954085}}{{Pezizomycetes-stub}}
3 : Pyronemataceae|Truffles (fungi)|Pezizales genera