Oak gall. Macrophotograph of a gall on a leaf of the pin oak (Quercus palustris). A gall is an abnormal outgrowth or swelling formed by a plant as a r

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Oak gall. Macrophotograph of a gall on a leaf of the pin oak (Quercus palustris). A gall is an abnormal outgrowth or swelling formed by a plant as a result of attack by parasites such as bacteria, fungi, nematodes, insects and mites. Photographed by the USGS Bee Inventory and Monitoring Lab: an organisation dedicated to identifying, cataloguing and monitoring bees and other species.

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Size: 4634px × 3772px
Photo credit: © US GEOLOGICAL SURVEY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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