We genotyped the mushrooms we obtained from the grocery store by PCR and sequencing of the ITS2 locus. The mushrooms we obtained were Hydnum umbilaticum, a species closely related to but distinct from the Hydnum repandum mushrooms from which repandiol (10) was originally isolated. We hypothesize that the Hydnum genus may produce a series of related epoxide-and diyne-containing compounds, the environmental function of which remains unknown. Later, we examined extracts of a hedgehog mushroom obtained from the wild, a gift of R. Nett, and found that is also contained repanol and no detectable trace of repandiol.