Cep is the common name of Boletus edulis but also has the local name in England of Penny Bun, the cap looking much like a traditional bakers bun! cep is common in woodlands during the summer and in to late autumn occurring in both coniferous or broad-leaved woodlands. In this country we are used to buying varieties of mushrooms in our supermarkets but in continental Europe cep is much more likely to be seen on sale in markets and shops. It is, however, grown commercially in this country to produce 'mushroom' flavourings for soups and the like.
So, it is edible and, without knowing it, I have probably eaten them!