Nemalion multifidum (F.Weber & D.Mohr) Chauvin
Description: Cylindrical, reddish to purple
brown, softly gelatinous thallus, simple or sparingly
dichotomously branched, 2-3 mm wide, 250 mm long, with discoid
base.
Habitat: Summer annual (May or June-September
or October) on exposed rocky shores, generally growing on
limpets (above) barnacles and mussels in the lower intertidal,
locally common on southern and western shores in Ireland and
Britain, rare and local on east coasts.
Similar species: Helminthocladia calvadosii (Lamouroux ex Duby)
Setchell, not included here, is a very rare shallow subtidal
species found on western and southern shores. It is generally
larger and broader than Nemalion and more profusely and
irregularly branched.
Helminthora divaricata
is more profusely branched and is generally an epiphyte on
Polyides rotundus.
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