Russula betularum
... that the brittlegill mushroom Russula betularum grows under birch, while the closely related Russula emetica is found under conifers?
... that the brittlegill <a href="./Mushroom" id="mwAa0" rel="mw:WikiLink" title="Mushroom">mushroom</a> <i id="mwAa4"><b id="mwAa8"><a href="./Russula_betularum" id="mwAbA" rel="mw:WikiLink" title="Russula betularum">Russula betularum</a></b></i> grows under <a href="./Birch" id="mwAbE" rel="mw:WikiLink" title="Birch">birch</a>, while the closely related <i id="mwAbI"><a href="./Russula_emetica" id="mwAbM" rel="mw:WikiLink" title="Russula emetica">Russula emetica</a></i> is found under <a href="./Conifer" id="mwAbQ" rel="mw:WikiLink" title="Conifer">conifers</a>?