Neottiella (Octospora) rutilans
Despite its rich peach-orange appearance N. rutilans (Pezizales: Pyronemataceae) is a small ascomycete fungus that can easily be overlooked where it grows, buried amongst Polytrichum mosses on heathland or in light sandy soils. The shallow cup or disc-shaped fruiting bodies, growing to around 5-15mm across, may become undulating and somewhat contorted where several fruiting bodies are condensed and crowded together. The above examples were recently photographed in a Sussex dune system.
Phillips, R. (2006). Mushrooms. London: Pan Macmillan, p. 367, fig. p. 366, e.
Sterry, P. and Hughes. B. (2009). Collins Complete Guide to British Mushrooms and Toadstools. London: HarperCollins, p. 314, fig. p. 315.