Dune Inkcap Coprinopsis ammophilae may be found in the same yellow dune area as Dune Brittlestem but is far less common with just 30 or so records on FRDBI. About half of these records are from the coast of Wales. This is the only one I found compared to many dozens of the Brittlestem. This find was well away from growing marram so was probably from burried debris. This is a Red Data List species.