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
syn. L. fennicum Renkonen. Only known in Britain from Tresco, Isles of Scilly, in 1967 and 1968, and more recently in East Sussex.
Found at Great Pool, Tresco (Mackechnie-Jarvis, 1969).
Habitat & Ecology
Occurs at the margins of ponds.
Changing land management practices, affecting drainage regimes; possibly changing arrangements for stock watering.
Protection of watersides from large scale changes in management.
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.