A rare species of coastal dune systems, often in association with marram grass (Ammophila arenaria), hence the name.

References: 
Dennis, R.W.G. (1978) British Ascomycetes
Breitenbach, J. & Kranzlin, F. (1984) Fungi of Switzerland, Volume 1, Ascomycetes
O'Reilly, P. (2016) Fascinated by Fungi