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The gall wasp (Andricus quercuscalicis) lays its eggs inside the acorn itself, causing it to mutate. When the infestation first appeared some thought it might wipe out England's oak trees. However, although these galls affect individual acorns and their cups, the net effect is not disastrous. Knopper galls were first recorded in the UK in the 1960s. They have spread rapidly across the country, until now they are one of the commonest oak galls across all England. The name 'pedunculate oak' refers to the situation of the acorns, which arise from long stems (peduncles), as distinguished from the 'sessile oak', where the acorns sit directly on the oak twigs.
pedunculate oak,\nQuercus robur small spring green leaves closeup selective focus
Leaf buds on old Oak tree (Quercus robur). Close up of branch, buds and new leaves on oak tree.
Quercus lobata, commonly called the valley oak. It is endemic to the state. Springtime; Santa Rosa Plain; Santa Rosa; Sonoma County; California. Globular galls up to several centimeters in diameter are frequently attached to twigs of mature specimens of valley oak. These house the larval stage of small indigenous wasps Andricus quercuscalifornicus.
Oak tree or Quercus (Italian tree)
Two solitaire oak trees in front of a dirt road in autumn sunlight. The photograph is taken in Dyrehaven, which is a large public park north of Copenhagen and an UNESCO Heritage site due to the landscape which is designed for the royal par force hunting
Quercus suber, commonly called cork oak, is a medium-sized evergreen oak in the Quercus section at the edge of a large clearing. Nature concept for design.
sole green old oak on green meadow
A nature scene featuring an aged tree stump surrounded by regrowth of Quercus leaves, symbolizing resilience. The composition beautifully highlights the harmony of life and decay against the blurred green forest background.
Springtime in a sessile oak (Quercus petraea) forest in Hungary
Acorn from Quercus lobata, commonly called the valley oak or roble, is the largest of the California oaks. It is endemic to the state. Santa Rosa, Sonoma County, California
Side shoots an oak
Acorn of oak tree (Quercus robur)
Vibrant trees adorned with fresh, green leaves bask joyfully in the warm sunlight of a serene outdoor setting Alte Eiche Hannover
Close-up of many green leaves of an English Oak tree (Quercus robor), as it comes into full leaf in midsummer in central England
lonely tree a the field against cloudy sky
Macro image of a trees fruit in Autumn.
Red Oak , Quercus rubra, spring flowers closeup selective focus
Acorn from Quercus lobata, commonly called the valley oak or roble, is the largest of the California oaks. It is endemic to the state. Santa Rosa, Sonoma County, California
Oak in summer
Landscape view of apple tree tops filled with green apples under a clear blue sky at a public pick-your-own orchard. The image captures the peaceful atmosphere of a sunny fall day, emphasizing natural textures, seasonal colors, and the abundance of harvest. Ideal for backgrounds, seasonal themes, and nature-focused content.
The bark of Quercus petraea, commonly known as the sessile oak
Stock photo captures the majestic presence of a growing English oak tree (Quercus robur) standing tall in a peaceful field. Its sprawling branches and sturdy trunk showcase the resilience and timeless beauty of this iconic tree species. Surrounded by open space, the oak symbolizes strength and endurance
Blad van een Amerikaanse eik Quercus rubra
Spring oak leaves in sunlight
Downy oak (Quercus pubescens) tree at Kras
These oaks are said to be more than 1000 years old
Young oak (Quercus robur ) seedlings in a forest clearing. Growing tree seedlings for landscaping desert areas.
Detailed macro shot of a Quercus robur (common oak) branch bearing fresh green leaves against a pale blue sky. The image highlights leaf morphology, venation patterns and springtime growth. Suitable for botanical studies, forestry, environmental science, native tree species documentation, seasonal imagery and nature stock libraries focusing on European flora.
Free Images: "bestof:Eiche Lohr, 2.jpg Eiche Sendelbach own 2011-07-03 Rainer Lippert Cc-zero Quercus robur"
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