Another picture from yesterday's walk with Bob H. at Bell Marin Keyes. Below is a description (much better than I could concoct) of what we saw. Neither Bob, nor I, have ever seen so many Galls on one twig.
The Oak Marble Gall (also known as 'Oak Nut') is caused by a tiny gall wasp, Andricus kollari. Clusters of Oak Marble Galls can be found on oak twigs. They turn brown as they mature and emergence holes, from which the asexual adults have escaped, can be seen from autumn onwards. The empty gall is left on the twig. The emerging females then lay eggs in the buds of Turkey Oaks which develop overwinter and emerge in spring as a sexual generation of males and females, ready to make the familiar summer gall.
Please remember that, though I am interested in content, I am perhaps even more interested in artistry.
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