Gomphidius is a genus of mushrooms, commonly known as spike-caps, that are members of the Boletales (suborder Suillineae),[1] or pored fungi.

[2] Elias Magnus Fries initially described the genus as Agaricus subgenus Gomphus in 1821, before renaming it Gomphidius in 1825.

[6] Miller suggested that the gasteroid species Gomphogaster leucosarx may lie within Gomphidius but did not analyse that taxon genetically.

[6] The members of the genus have pink- to purple-, grey- or brown-tinted caps that have a sticky surface and a varnished appearance when dry.

[5] Gomphidius species associate with members of the subfamilies Piceoideae (Picea), Laricoideae (Larix and Pseudotsuga) and Abietoideae (Abies and Tsuga) within the Pinaceae.