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A gall on a oak tree, with the exit hole of the wasp clearly shown.

Oak galls, ink nuts on oak. Cynips quercusfolii

Biorhza pallida on Quercus robur

The Valley Oak, can sometimes be riddled with large growths along the stem. Small wasps produce these oak apples or galls. The large oak apples, are induced by the gallwasp Andricus californicus. Shollenberger Park; Petaluma Wetlands; Petaluma; Sonoma County; California. Quercus lobata.

Cynips quercusfolii known as gall wasp, round ball gall underside of common oak leaf Quercus robur. Inside is bug larva. Autumn day.

The oak apple or oak gall is the oak tree's reaction to being burrowed into by a kind of ant or wasp. In the UK, 'Oak Apple Day' is on the 29th May and commemorates the restoration of King Charles II in 1660. (King Charles is supposed to have hidden in an oak tree, 'the King's oak').

Sick Oak leaf when oak bile wasps add eggs to their offspring, white background isolated

Close up of apple oak gall growing on valley oak, Quercus lobata, in California. Growth of gall is induced by a wasp larva inside the gall.

Tree infection. Close up.

A marble oak gall sitting on an old wooden ledge, against a plain background.

Oak gall on a oak tree

Acorns on the rock in the forest

A red apple gall on a stem of oak tree isolated on white.

View of an acorn plant.

$Quercus acutissima\nクヌギ$

A tiny acorn growing on an oak tree in a forest.

Tree infection. Flat lay.

Fallen wild fruit seeds and shoots growing on forest ground

Fruit mummy on an apple tree.

An oak is a tree or shrub in the genus Quercus. Oaks have spirally arranged leaves, with lobate margins in many species; some have serrated leaves or entire leaves with smooth margins. The fruit is a nut called an acorn or oak nut borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on their species.

Snow on plants in winter

oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.

Closeup view of leaf galls parasite.

A sprouting acorn being held by a person

Green-leaved branch with clusters of green berries - serrated foliage - daylight shot - blurred background. Taken in Toronto, Canada.

chinese medicine semen momordicae, Momordica cochinchinensis

Galls on an oak tree in spring

Tiny acorns growing on an oak tree in a forest.

Horse Chestnut Fruit Macro Shot Autumn Background

Australian bottlebrush plant in afternoon light

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