Off the woodland trust website
The hard black fruiting bodies of the fungi Daldinia concentrica and Hypoxylon spp are remarkably favoured by insects. The precise species of fungus appears not important, rather the hard black medium provided: the scarce fungus weevil Platyrhinus resinosus develops in Daldinia concentrica on ash trees as well as Hypoxylon fragiforme on beech, and other beetles behave similarly, eg Biphyllus lunatus, Litargus connexus, and Mycetophagus atomarius.