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Hallo!

From the forum: www.entomologie.de
Sorry for my english!

Dry meadow on the edge of a group of trees. The grub was in the stem of the mushroom (from the outside still fresh-looking fungus inside the stem-area slightly corroded) - yellowish flesh especially in the stem, otherwise whitish.

Mushroom: Boletineae

Thanks Ira

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I can rule out some groups. Most fungus feeding Nematocera (excepting some Cecidomyiidae) have a strongly contrasting dark head capsule. Platypezidae and Fanniidae have distinctive larvae, flattened with spines.

In addition to the basal Cecidomyiidae, some Anthomyiidae eat fungus. Probably some species of many families do.

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Thanks for your detailed answer.

Ira