{{Short description|Genus of kelp}} {{Speciesbox |image = Eualaria fistulosa, Seldovia, Kenai Peninsula, Alaska 1.jpg |image_alt = |image_caption = ''Eualaria fistulosa'' on the Kenai Peninsula, Alaska |genus = Eualaria |parent_authority = Areschoug 1884 |species = fistulosa |authority = (Postels & Ruprecht) M.J.Wynne 2009 |synonyms = *''Alaria fistulosa'' {{small|Postels & Ruprecht 1840}} *''Alaria fistulosa'' f. ''platyphylla'' {{small|Setchell 1901}} *''Alaria fistulosa'' f. ''stenophylla'' {{small|Setchell 1903}} *''Orgyia fistulosa'' {{small|(Postels & Ruprecht) Trevisan 1845}} *''Phasganon fistulosum'' {{small|(Postels & Ruprecht) Ruprecht 1850}} *''Druehlia fistulosa'' {{small|(Postels & Ruprecht) C.E.Lane & G.W.Saunders 2007}} |synonyms_ref = <ref name="AlgaeBase">{{cite web |last1=Guiry |first1=M.D. |title=''Eualaria'' Areschoug, 1884 |url=https://www.algaebase.org/search/genus/detail/?genus_id=50879 |website=AlgaeBase |publisher=National University of Ireland, Galway |access-date=15 January 2025 |date=3 January 2021}}</ref> }}
'''''Eualaria''''' is a monotypic genus of subtidal kelp containing the species '''''Eualaria fistulosa''''' (synonym ''Alaria fistulosa'').<ref name = AlgaeBase/> Its native Alaskan name is '''Kausam'''.{{Clarify|date=June 2025|reason=Which of the several Native Alaskan languages?}}
==Description== The entire plant consists of a holdfast and a single very large frond or lamina. In one instance, at Anchor Point, Cook Inlet, Alaska, a lamina collected by Griggs and Rigg was {{convert|22|m|ft|sp=us}} long by {{cvt|170|cm}} wide.<ref>{{cite journal | last1= Frye | first1= T.C. | last2= Rigg | first2= G. B. | last3= Crandall | first3= W.C. |date= December 1915 | title= The Size of Kelps of the Pacific Coast of North America | journal= Botanical Gazette | volume= 60 | issue= 6 | page= 481 | doi= 10.1086/331689 | url= https://www.biodiversitylibrary.org/part/223717 }}</ref> Other laminae have been measured as wide as {{cvt|252|cm}}<ref>Frye, Bot. Gazette, loc.cit.</ref> and others as long as {{cvt|25|m}}<ref>{{cite journal | last1= Setchell | first1= William A. | last2= Gardner | first2= Nathaniel L. | date= March 31, 1903 | title= Algae of Northwestern North America | journal= University of Cailfornia Publications in Botany |volume= <not given> | page= 277 }}</ref> Unusually among kelps, the laminae of Eualaria have midribs.
==Distribution and habitat== It is native to the northern Pacific Ocean, where it ranges from the coast of Alaska and the Aleutian Islands to the Commander Islands, Russian Far East, Sakhalin, Kuril Islands, and Japan. It grows in the subtidal zone to a depth of 10 meters.<ref name = AlgaeBase/>
==References== {{Commons category|Eualaria fistulosa}} {{Reflist}}
{{Wikispecies}}
{{Taxonbar|from=Q21225206|from2=Q29347901}}
Category:Laminariaceae Category:Biota of the Temperate Northern Pacific Category:Flora of Alaska Category:Flora of the Russian Far East Category:Flora of Japan Category:Laminariales genera Category:Monotypic brown algae genera Category:Taxa described in 1884