gall

thumb|upright=1.35|Cola-nut galls ([[Andricus lignicola) on pedunculate oak, caused by a cynipid gall wasp ]]

Galls (from the Latin , 'oak-apple') or cecidia (from the Greek , anything gushing out) are a kind of swelling growth on the external tissues of plants. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or warts in animals. They can be caused by various parasites, from viruses, fungi and bacteria, to other plants, insects and mites. Plant galls can be such highly organized structures that their cause can be determined without the actual agent being identified. This applies particularly to insect and mite plant galls. The study of plant galls is known as cecidology.