Gomphidius is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of mushrooms, commonly known as spike-caps, that are members of the Boletales

Boletales

The Boletales are an order of Agaricomycetes, containing over 1300 species with a diverse array of fruiting body types. The boletes are the best known members of this group, and until recently, the Boletales were thought to only contain boletes...

 (suborder Suillineae), or pored fungi. They appear to have gill-like structures which resemble those of agarics

Agaricales

The fungal order Agaricales, also known as gilled mushrooms , or euagarics, contains some of the most familiar types of mushrooms. The order has 33 extant families, 413 genera, and over 13000 described species, along with five extinct genera known only from the fossil record...

, however the similarity is superficial only. The best-known member is the slimy spike-cap (Gomphidius glutinosus

Gomphidius glutinosus

Gomphidius glutinosus, commonly known as the slimy spike-cap, is a gilled mushroom found in Europe. Although it has gills, it is a member of the order Boletales, along with the boletes. The fruiting bodies sprout in pine, fir and spruce woodland in Europe in autumn...

). The genus has a widespread distribution, especially in north temperate

Temperate

In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...

 areas, and contains 10 species.

List of species

• Gomphidius borealis - (Siberia
  Siberia
  Siberia is an extensive region constituting almost all of Northern Asia. Comprising the central and eastern portion of the Russian Federation, it was part of the Soviet Union from its beginning, as its predecessor states, the Tsardom of Russia and the Russian Empire, conquered it during the 16th...
  
  )
• Gomphidius britannicus
• Gomphidius glutinosus
  Gomphidius glutinosus
  Gomphidius glutinosus, commonly known as the slimy spike-cap, is a gilled mushroom found in Europe. Although it has gills, it is a member of the order Boletales, along with the boletes. The fruiting bodies sprout in pine, fir and spruce woodland in Europe in autumn...
  
  - Slimy spike-cap (Europe)
• Gomphidius maculatus
• Gomphidius mediterraneus
• Gomphidius oregonensis
  Gomphidius oregonensis
  Gomphidius oregonensis, commonly known as Insidious Gomphidius is a mushroom found only in western North America, most commonly on the Pacific Coast. G. oregonensis can be distinguished by its spores which are the shortest in the genus, typically less than 14 microns long. Earlier in growth, G...
  
  
• Gomphidius pseudoflavipes - (North America)
• Gomphidius roseus
  Gomphidius roseus
  Gomphidius roseus, commonly known as the rosy spike-cap or pink gomphidius, is a gilled mushroom found in Europe. Although it has gills, it is a member of the order Boletales, along with the boletes...
  
  - (Europe)
• Gomphidius subroseus - (North America)
• Gomphidius viscidus