The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
Native. Eurasian Southern-temperate species. Found scattered around much of the coast of the British Isles.
Since 1999 it has been found in the upper parts of the Lynher (SX35) and Tamar (SX45) estuaries. It probably still grows in the East Looe river (SX25) and may still occur in the Helford River (SW72). It is much less common than Z. marina .
Habitat & Ecology
It grows in a narrow zone in the upper parts of estuaries on shelly sand and mud, in open inter-tidal areas.
Disturbance through dredging, inappropriate dumping and unsympathetically placed
Most sites are protected.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.