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.
This is the most commonly recorded Tolypella sp. of stonewort in Britain and Ireland,
however, in Cornwall it is known from only one site, on Penhale dunes near Perranporth. Here it grows in small amounts in shallow water, amongst other charophytes species, in highly calcareous dune slacks which are winter-flooded and which have a relatively high pH. The site lies within the boundaries of the Ministry of Defence army training camp at Penhale.
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.