Fucus Guiryi
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''Fucus guiryi'' is a
brown alga Brown algae (: alga) are a large group of multicellular algae comprising the class Phaeophyceae. They include many seaweeds located in colder waters of the Northern Hemisphere. Brown algae are the major seaweeds of the temperate and polar reg ...
in the family
Fucaceae The Fucaceae are a family of brown algae, containing six genera: *''Ascophyllum'' Stackhouse – one species *''Fucus'' L. – 15 species *'' Hesperophycus'' Setchell & Gardner – one species *''Pelvetia ''Pelvetia canaliculata'', the channel ...
. It is known from numerous locations along the east coast of the North Atlantic Ocean, from
Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...
to the
Canary Islands The Canary Islands (; ) or Canaries are an archipelago in the Atlantic Ocean and the southernmost Autonomous communities of Spain, Autonomous Community of Spain. They are located in the northwest of Africa, with the closest point to the cont ...
.Algaebase, Fucus guiryi
/ref> The species is named in honor of Irish botanist Michael D. Guiry.


Description

The thallus grows to 35 cm long - smaller than other similar species, it is attached by a discoid
holdfast Holdfast most often refers to: *Holdfast (biology), a root-like structure that anchors aquatic sessile organisms to their substrate *Holdfast (tool), a tool used to secure a workpiece to a workbench or anvil Holdfast or hold fast may also refer t ...
. The
thallus Thallus (: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. A thallus usually names the entir ...
is flattened and has a midrib like the other common species of ''
Fucus ''Fucus'' is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world. Description and life cycle The thallus is perennial with an irregular or disc-shaped holdfast or with haptera. The erect portion ...
''. However it does not have bladders, as ''
Fucus vesiculosus ''Fucus vesiculosus'', known by the common names bladderwrack, black tang, rockweed, sea grapes, bladder fucus, sea oak, cut weed, dyers fucus, red fucus and rock wrack, is a seaweed found on the coasts of the North Sea, the western Baltic Sea ...
'', or serrated edges to the fronds as ''
Fucus serratus ''Fucus serratus'' is a seaweed of the north Atlantic Ocean, known as toothed wrack, serrated wrack, or saw wrack. Description and reproduction ''Fucus serratus'' is a robust alga, olive-brown in colour and similar to ''Fucus vesiculosus'' an ...
'' nor a twisted thallus, as ''
Fucus spiralis ''Fucus spiralis'' is a species of seaweed, a brown alga (Heterokontophyta, Phaeophyceae), living on the littoral shore of the Atlantic coasts of Europe and North America. It has the common names of spiral wrack and flat wrack. Description ''Fu ...
''. '' Fucus ceranoides'' does not have bladders but may have elongated air pockets in the fronds. The receptacles on ''F. guiryi'' show a distinct rim around the edge.Bunker, F.StP, D, Maggs, C.A., Brodie, J.A., Bunker, A.R. 2017. ''Seaweeds of Britain and Ireland''. Second Edition. Wild Nature Press, Plymouth


Habitat

Found growing on rock in the upper mid-littoral.


References

{{Taxonbar, from=Q12231399 Fucaceae