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Cynips quercusfolii known as gall wasp, round ball gall underside of common oak leaf Quercus robur. Inside is bug larva. Autumn day.
Oak gall on a oak tree
oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.
A gall on a oak tree, with the exit hole of the wasp clearly shown.
Andricus quercustozae Oak bud gall wasp gills of small wasps on the oaks gray background defocused natural lighting
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 red apple gall on a stem of oak tree isolated on white.
oak galls, on the tree branch, in the Guadarrama mountains in Madrid
Oak galls, ink nuts on oak. Cynips quercusfolii
Gall Enlargement On A Plant Stem. Galls are created by parasitic insects.
Horse Chestnut Fruit Macro Shot Autumn Background
Tree infection. Closeup.
Galls on an oak tree in spring
Gall wasps are insects that lay their eggs in plant tissue. This is where growths, known as Gqallen, develop. The larvae of the gall wasps grow in these growths. Most species of gall wasps occur in the Mediterranean region and on the Black Sea, there are no gall wasps in the tropics.
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.
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.
Acorns on the rock in the forest
chinese medicine   semen momordicae, Momordica cochinchinensis
A marble oak gall sitting on an old wooden ledge, against a plain background.
Oak galls
Common Oak Gall Wasp, Gemeine Eichengallwespe, Cynips Quercusfolii
A tiny acorn growing on an oak tree in a forest.
Biorhza pallida on Quercus robur
Fremontodendron californicum, with the common names California flannelbush, California fremontia, and flannel bush, is a flowering shrub native to diverse habitats in southwestern North America.  \tMalvaceae. Seed pod.
Macro close-up photograph of an oak gall (Quercus species, induced by gall wasps Cynipidae) growing on a tree branch in a natural forest setting. The spherical gall shows a rough textured surface with small spots, captured in soft daylight with shallow depth of field and a blurred background. This detailed macro shot highlights botanical morphology and insect–plant interaction in a woodland habitat.
Sweetgum tree in the autumn, close up of a tree
These photos were taken naturally and casually, during a morning walk. There are a variety of elements, textures, insects, colors, and animals. They are all part of a whole that lives in San Isidro.Estas fotos son tomadas en forma natural y casual, en el paseo matutino. Hay variedad de elementos, texturas, insectos, colores y animales. Todos forman parte de un todo que vive en San Isidro.
Bitter almond in winter
Austrian oak acorns on the tree
Acorn Oak tree Acorn cap
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