Phymatolithon lenormandii is a common red alga.
Description Phymatolithon lenormandii is a thin alga growing encrusting as a thin flat chalky thallus clearly without branches. The thallus grows to 0.6 mm Newton, L. 1931 A Handbook of the British Seaweeds. British Museum thick with a smooth surface. In colour it is mauvish or pinkishIrvine M.Irvine and Chamberlain, Y.M. 1994 Seaweeds of the British Isles Volume 1 Rhodophyta Part 2B Corallinales, Hildenbrandiales The Natural History Museum, London like a thin painted surface forming a patchwork when meeting other incrusting algae.Bunker, F.StP. D., Brodie, J.A., Maggs, C.A. and Bunker, A.R. 2017. Seaweeds of Britain and Ireland Second Edition.p34 Wild Nature Press, Plymouth .
Habitat Common, epilithic on rock and shells in the literal and sublittoral to a depth of 30m, growing best in shady sites.Dickinson, C.I. 1963 British Seaweeds The Kew Series
Reproduction Monecious or dioecious with conceptacles, carpospogonia and tetrasporangial conceptacles forming raised chambers.
Distribution Common around Ireland, Great Britain, the Isle of Man and the Channel Isles.Hardy, F.G. and Guiry, M.D. 2003. A Check-list and Atlas of the Seaweeds of Britain and Ireland. British Phycological Society, In Europe it is recorded from Norway to the Mediterranean. World-wide from Canada USA Mexico, Japan and southern America.
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