Fasciation

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What Wikipedia says

Fasciation (pronounced , from the Latin root meaning "band" or "stripe"), also known as cresting, is a relatively rare condition of abnormal growth in vascular plants in which the apical meristem (growing tip), which normally is concentrated around a single point and produces approximately cylindrical tissue, instead becomes elongated perpendicularly to the direction of growth, thus producing flattened, ribbon-like, crested (or "cristate"), or elaborately contorted tissue.

Excerpt from the Wikipedia article “Fasciation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Perduejn, CC BY 3.0, via Wikimedia Commons.