Dune Waxcap Taken at Tyninghame Bay on 24th September 2017 using Panasonic Lumix LX5 in macro mode. Taken at Doonfoot on 6th October 2019 using Panasonic Lumix LX5 in macro mode. Dune Waxcap. Species: Order: Family: Hygrocybe conicoides. Agaricales. Hygrophoraceae Habitat: Description: Height: Season: Edibility: Short grass, mainly on coastal sand dunes. Red, orange or yellow caps, which are broadly conical and typically 2 to 4cm in diameter, are silky in dry weather but become greasy when wet. The caps blacken only slightly and slowly in places with age or when cut or bruised. 2 - 7 cms. August - September Edible but heavily ingrained with sand When picking any fungus for consumption, caution should be exercised at all times.