Fungus?

Fungus?

Observation - Fungus? - UK and Ireland. Description: On underside of Oak Quercus robur leaf. About 3mm wide and tall spiky grey clay colour. Appeared to give off spores

On underside of Oak Quercus robur leaf. About 3mm wide and tall spiky grey clay colour. Appeared to give off spores

Edit: comments not appearing one suggestion is this is 'Cordyceps' on an insect. Any thoughts appreciated