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oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.
Oak galls, ink nuts on oak. Cynips quercusfolii
Biorhza pallida on Quercus robur
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.
Oak gall on a oak tree
A gall on a oak tree, with the exit hole of the wasp clearly shown.
Sick Oak leaf when oak bile wasps add eggs to their offspring, white background isolated
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
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.
A red apple gall on a stem of oak tree isolated on white.
A marble oak gall sitting on an old wooden ledge, against a plain background.
Tree infection. Close up.
Acorns on the rock in the forest
Cynips quercusfolii known as gall wasp, round ball gall underside of common oak leaf Quercus robur. Inside is bug larva. Autumn day.
A tiny acorn growing on an oak tree in a forest.
Galls on an oak tree in spring
View of an acorn plant.
Fruit mummy on an apple tree.
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.
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').
A ripe selection of fruits hangs from the branches of a lush tree
Colorful autumn leaves.
A close-up image of an achiote with a unique, green shape and red spikes. The fruit is centered in the image and surrounded by vibrant green leaves.
Fallen wild fruit seeds and shoots growing on forest ground
Tree infection. Flat lay.
Tiny acorns growing on an oak tree in a forest.
Horse Chestnut Fruit Macro Shot Autumn Background
chinese medicine   semen momordicae, Momordica cochinchinensis
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