Hydnum

Hydnum is a genus of fungi in the family Hydnaceae. They are notable for their unusual spore-bearing structures of teeth rather than gills. The best known are the edible species Hydnum repandum and H. rufescens. The word is derived from (h)udnon/ύδνον, an Ancient Greek word for truffle. The white or buff Hydnum repandum has a spore scatterer of still another shape. The smooth cap grows as wide as 8 inches across. The stem is off-center and is less than 2 inches long. Hydnum has many brittle, white teeth from which the spores drop. The mushrooms of the Hydnum group grow both on ground and on wood. Some species have teeth which hang from ascending branches, while other species have teeth which project downwards from the undersurfaces of dead wood. Most Hydnum are safe to eat.

Hydnum
Hydnum repandum
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Cantharellales
Family: Hydnaceae
Genus: Hydnum
L. (1753)
Type species
Hydnum repandum
L. (1753)
Synonyms[1]

Erinaceus Dill. (1719)
Bidona Adans. (1763)
Bidonia Adans. (1763)
Echinus Haller (1768)
Hypothele Paulet (1808)
Dentinum Gray (1821)
Erinaceus Dill. ex Maratti (1822)
Tyrodon P.Karst. (1881)

Taxonomy and diversity

Traditionally, only 7 species were widely recognised. However a 2016 paper sampling populations from around the world found 31 lineages that could be described as species.[2]

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gollark: So maybe stop that rather than all patents for medical things.
gollark: ... if it's public-sector, wouldn't it just not be patented anyway?
gollark: It's not *quite* 1984-level.
gollark: At least the US's handling of it makes me feel better about the UK.

References
  1. "Hydnum L. 1753". MycoBank. International Mycological Association. Retrieved 2011-06-17.
  2. Feng B, Wang XH, Ratkowsky D, Gates G, Lee SS, Grebenc T, Yang ZL (2016). "Multilocus phylogenetic analyses reveal unexpected abundant diversity and significant disjunct distribution pattern of the Hedgehog Mushrooms (Hydnum L.)". Scientific Reports. 6. 25586. doi:10.1038/srep25586. PMC 4858670. PMID 27151256.
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