Quercus lusitanica

Gall Oak, a reference photo
Photo: Franz Eugen Köhler, Köhler's Medizinal-Pflanzen · Public domain

Quercus lusitanica, commonly known as gall oak, Lusitanian oak, or dyer's oak, is a species of oak native to Portugal, Spain (Galicia and western Andalucia) and Morocco. Quercus lusitanica is the source of commercial nutgalls. These galls are produced by the infection from the insect Cynips gallae tinctoriae. They are used for dyeing.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Gall Oak being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Fagales
Family
Fagaceae
Genus
Quercus
Species
Quercus lusitanica

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