Gall of Asteromyia carbonifera (Cecidomyiidae) on goldenrod. The gall is made by a fungus, Botryosphaeria dothidea, which creates a hard, internal pocket (stroma) that makes it difficult for parasitoids such as Torymus capite (Chalcidoidea) to find the larvae inside. Female midges collect conidia of this fungal species and store them in special pockets (mycangia) on their ovipositors. #fly #diptera #insects #entomology #macro #fungi #mutualism #gall #galls #GallWeek