Bird's-nest orchid (Neottia nidus-avis) and Sebacina

Bird's-nest orchid (Neottia nidus-avis) is an orchid found here and there in Denmark, especially in beech forests on the islands and in East and South Jutland. It is characterized by, among other things, by being without chlorophyll, so that it cannot carry out photosynthesis, just as the flowers are also light brown. It is therefore easy to overlook, especially against its typical background of withered leaves. Since it cannot carry out photosynthesis, it must obtain its carbohydrates in another way, and this happens through an unknown coexistence with one or more different species of fungi. The benefit of the fungus from the cohabitation is unknown, so it is possible that the Bird's-nest orchid simply parasitizes the fungus.
The fungus is typically a species of the genus Sebacina, which is widespread and quite common east of the glacial border, and does mycorrhiza with several different trees, e.g. beech. However, its fruiting bodies are not very conspicuous. Despite not having the typical toadstool-shaped fruiting body, it belongs to Agaricomycetes.