BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Fasciation in a woolly chamomile flower head (Anthemis tomentosa). Fasiciation is a condition in which the growing tip (apical meristem) of a plant becomes elongated, producing flattened, broadened or contorted tissue. It may be caused by a genetic mutation in the meristematic cells, bacterial infection or insect attack. It is also initiated by mechanical or chemical means, such as damage from frost action or hoeing. Photographed in Greece, in April.
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