Nemalion helminthoides is a small marine alga in the division Rhodophyta.
Description This is a fairly large erect alga which grows to no more than 0.4 m long. The frond is erect with a solid axis. It is very mucilaginous and has few branches which are elongate growing from a discoid base. The central strand is composed of filaments intricately entangled.Dixon, P.S. and Irvine, L.M.1977. Seaweeds of the British Isles Volume 1 Rhodophyta Part 1 Introduction, Nemaliales, Gigartinales. British Museum (Natural History)
Habitat Midlittoral, epilithic and on BalanusHardy, F.G and Guiry, M.D. 2003. A Check-list and Atlas of the Seaweeds of Britain and Ireland. The British Phycological Society. Patella.
Reproduction The life-history is not fully confirmed. However carpospores and tetrasporangia have been recorded.
Distribution Generally distributed around the European coast and the Atlantic coast of North America.
Note The spelling of the specific name is in older references spelt without the first letter "h". However helminthoides is considered more correct.
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