Pea galls on oak - geograph.org.uk - 1449701

Description:

Summary[edit] Description: English: Pea galls on oak The pea galls of the title are the pale globular objects that are attached to the midrib of the leaf and to the side-veins; several examples, of varied sizes, are visible. These galls, which are caused by the Cynipid wasp species Cynips divisa, are fairly common; they are hard, unlike the currant gall – https://www.geograph.org.uk/photo/1336489 – and they contain a small chamber within which a wasp larva develops. The photo shows two other kinds of gall. The numerous flat reddish-brown objects with central mounds are common spangle galls ( https://www.geograph.org.uk/photo/929354 ). Towards the upper left, on a different leaf, some silk button spangle galls ( https://www.geograph.org.uk/photo/929338 ) can be seen; these are smaller, with a raised rim. At least five types of gall were present on this young tree: three of them are shown in this photo; the others were knopper galls ( https://www.geograph.org.uk/photo/950030 ), and a single mature example of an artichoke gall ( https://www.geograph.org.uk/photo/950022 ). Date: 10 August 2009. Source: From geograph.org.uk. Author: Lairich Rig. Attribution(required by the license)Lairich Rig / Pea galls on oak / CC BY-SA 2.0. Lairich Rig / Pea galls on oak. Camera location55° 57′ 17.3″ N, 4° 34′ 46″ W View all coordinates using: OpenStreetMap 55.954800; -4.579400. Object location55° 57′ 17.3″ N, 4° 34′ 46″ W View all coordinates using: OpenStreetMap 55.954800; -4.579400.