''Scytosiphon lomentaria'' is a

littoral The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal areas ...

brown

seaweed Seaweed, or macroalgae, refers to thousands of species of macroscopic, multicellular, marine algae. The term includes some types of '' Rhodophyta'' (red), ''Phaeophyta'' (brown) and ''Chlorophyta'' (green) macroalgae. Seaweed species such as ...

with an irregularly lobed many filamentous form. It is a member of the

Phaeophyta Brown algae (singular: alga), comprising the class Phaeophyceae, are a large group of multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere. Brown algae are the major seaweeds of the temperate and ...

in the order Dictyosiphonales and grows attached to shells and stones in rock-pools and in near-shore waters. The attachment to the substrate is by a small disc shaped holdfast.

Description

''Scytosiphon lomentaria'' has cylindrical, shiny, olive brown, unbranched fronds up to 400 mm long. They have short stalks and a large number may arise from a single holdfast. They widen to 3-10mm and narrow again near the tip. They are hollow and often have irregular constrictions.The Seaweed Site
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Distribution and habitat

This species is cosmopolitan in distribution being found in temperate waters around the world. The type location is

Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Danish Realm, Kingdom of Denmark ...

. It occurs in the

littoral zone The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal areas ...

and favours wave-exposed shores and rock pools. Small plants are often found growing on

limpet Limpets are a group of aquatic snails that exhibit a conical shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning the various groups called "limpets" descended indep ...

s and pebbles.

References

Dictyosiphonales {{Phaeophyceae-stub