taken 10 years ago, near to Cambridge, Cambridgeshire, England
Witch's brooms
Prominent in winter on two adjacent trees in the Shire Hall grounds on Castle Hill. Witch's broom is a deformity where a dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird's nest. It may be caused by pathogens or parasites such as fungi, insects or viruses.
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