They found the new species –– tuber mesentericum, entoloma jahnii and inocybe bresadolae –– at various locations around the park and believe this year's rainy summer could be the reason for their appearance.

Said Caroline Hobart, of the British Mycological Society: "Heavy summer rain doesn't suit all types of fungi, but does seem to benefit those species that live underground.

"These are significant findings of national interest, and very exciting. It's rare to find this many good examples at one site and reflects the good conditions at Clumber for a wide variety of fungi."

Two other rare species, coprinellus velatopruinatus and melanoleuca verrucipes, were also discovered at the park –– which boasts more than 400 different types of fungi.

Said Clumber spokesman Laura Shaw: "We have a lot of different types of land at the park and it covers a very wide area so we get everything from heath to very wooded and grassy areas, which helps in discovering so many.

"We also have a lot of wardens, park rangers and very experienced gardeners who help the park take part in various nature surveys by the national trust."

The new discoveries will now be sent off to scientists and experts to be examined and catalogued.