Aceria cornuta (Reuter, 1890)
The inflorescence is more or less disfigured, parts of the spikelets are leaflike.
This mite species is often encountered together with Aceria tenuis; they live primarily in the length grooves over the leaves. The relationship between both species, and their contribution to the galling of the host plant, is not clear.
Buhr (1964a, 1965a), Dauphin & Aniotsbehere (1997a), Houard (1908a), Reuter (1900a, 1902a), Roivainen (1950a), Roskam (2009a), Tomasi (2014a).