Reference: The Freshwater Algal Flora of the British Isles 2nd edn (2011), p. 755, pl. 182C (p. 745), pl. 186B (p. 751)
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith