Gall

Gall

Observation - Gall - UK and Ireland. Description: This looks like a large Gall on a Sweet Chestnut tree. There is an other one at the other side of this wooded area. Could be viral or fungal. 40 cm across.

This looks like a large Gall on a Sweet Chestnut tree. There is an other one at the other side of this wooded area.
Could be viral or fungal.
40 cm across.