{{Short description|Species of fungus}} {{Speciesbox | image = Sarcodon joeides 37404.jpg | image_caption = | genus = Hydnellum | species = joeides | authority = (Pass.) E.Larss., K.H.Larss. & Kõljalg<ref name="Larsson 2019">{{Cite journal|author1=Larsson|author2=Svantesson|author3=Miscevic|author4=Kõljalg|author5=Larsson|date=2019|title=Reassessment of the generic limits for Hydnellum and Sarcodon (Thelephorales, Basidiomycota)|journal=MycoKeys|volume=54|pages=31–47|doi=10.3897/mycokeys.54.35386|pmid=31231164|pmc=6579789 |doi-access=free }}</ref> | synonyms_ref = <ref name="urlFungorum synonymy: Sarcodon joeides"/> | synonyms = * ''Hydnum joeides'' <small>Pass. (1872)</small> * ''Sarcodon joeides'' <small>(Pass.) Bataille (1924)</small> }}

'''''Hydnellum joeides''''' (the epithet is sometimes spelled ''ionides'' or ''jonides'')<ref name="urlMycoBank: Hydnum joeides"/> is a species of tooth fungus in the family ''Bankeraceae''.

==Taxonomy== It was first described by Italian botanist Giovanni Passerini in 1872 as ''Hydnum joeides''.<ref name="Passerini 1872"/> Frédéric Bataille transferred it to the genus ''Sarcodon'' in 1924.<ref name="Bataille 1924"/>

==Description== The fungus makes fruit bodies with flattened to concave caps measuring {{convert|2.5|–|10|cm|in|1|abbr=on}} in diameter. They initially have a velvety surface texture that later breaks up into reddish-brown scales. The crowded spines on the cap underside are up to 3&nbsp;mm long, and are decurrent on the stipe. Initially pale pink, they become brownish in age. Spores are tuberculate (covered in warts), and measure 6.3–7.2 by 4–4.7&nbsp;μm.<ref name="Maas Geesteranus 1971"/>

It is reportedly inedible.<ref>{{cite book |last=Phillips |first=Roger |title=Mushrooms and Other Fungi of North America |year=2010 |publisher=Firefly Books |location=Buffalo, NY |isbn=978-1-55407-651-2 |page=326}}</ref>

==Habitat and distribution== The fungus is found in western and central Europe, where it is an ectomycorrhizal symbiont of European beech (''Fagus sylvatica''), English oak (''Quercus robur''), and probably sessile oak (''Quercus petraea''). It is on the red lists of several countries: Flandres, France and Norway (critically endangered); The Netherlands, Germany, Lower Saxony and Switzerland (endangered); and Sweden (vulnerable). Because of the continued decline in sightings in Europe, it has been proposed for inclusion on the IUCN Red List of Threatened Species.<ref name="IUCN"/>

The species has also been reported from the United States,<ref name="Baird 2013"/> and New Zealand, although mycologist Eef Arnolds regards these records as doubtful because of discrepancies in the reported sizes of the spores.<ref name="IUCN"/>

==References== {{Reflist|refs=

<ref name="Baird 2013">{{cite journal |author1=Baird RE |author2=Wallace LE |author3=Baker G |author4=Scruggs M |title=Stipitate hydnoid fungi of the temperate southeastern United States |journal=Fungal Diversity |year=2013 |volume=62 |issue=1 |pages=41–114 |doi=10.1007/s13225-013-0261-6|s2cid=16846274 }}</ref>

<ref name="Bataille 1924">{{cite journal |author=Bataille F. |title=Flore analytique-descriptive des Hydnes terrestres d'Europe |journal=Bulletin de la Société Mycologique de France |year=1923 |volume=39 |pages=201–216 |language=fr |url=https://www.biodiversitylibrary.org/page/34186901}}</ref>

<ref name="IUCN">{{cite web |author=Arnolds E. |title=''Sarcodon joeides'' (Pass.) Bataille |url=http://iucn.ekoo.se/iucn/species_view/454332 |work=The Global Fungal Red List Initiative |access-date=2016-01-21}}</ref>

<ref name="Maas Geesteranus 1971">{{cite journal |author=Maas Geesteranus RA. |title=Hydnaceous fungi of the eastern old world |journal=Verhandelingen Koninklijke Nederlandse Akademie van Wetenschappen Afdeling Natuurkunde |year=1971 |volume=60 |issue=3 |series=2 |pages=162–163}}</ref>

<ref name="Passerini 1872">{{cite journal |author=Passerini G. |title=Funghi Parmensi |journal=Nuovo Giornale Botanico Italiano |year=1872 |volume=4 |url=http://babel.hathitrust.org/cgi/pt?id=wu.89097505549;view=1up;seq=163 |page=157 |language=la}}</ref>

<ref name="urlFungorum synonymy: Sarcodon joeides">{{cite web |title=''Sarcodon joeides'' (Pass.) Bataille |url=http://www.speciesfungorum.org/GSD/GSDspecies.asp?RecordID=454332 |publisher=Species Fungorum. CAB International |access-date=2016-01-21}}</ref>

<ref name="urlMycoBank: Hydnum joeides">{{cite web |title=''Hydnum joeides'' Pass. |url=http://www.mycobank.org/BioloMICS.aspx?TableKey=14682616000000067&Rec=463814&Fields=All |publisher=MycoBank. International Mycological Association |access-date=2016-01-21}}</ref>

}}

==External links== *{{IndexFungorum|454332}}

{{Taxonbar|from=Q9333916}}

Category:Fungi described in 1872 Category:Fungi of Europe joeides Category:Inedible fungi Category:Fungus species