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It looks really odd! Fantastic find :)
The condition is called Fasciation, it happens when the growing point (apical meristem) of the plant becomes elongated. There are various causes of this happening including physical damage, infection or genetics.
That is incredible!
Welcome to iSpot!
Great observation, thanks for sharing, I've never seen anything like that before!
Well done, Jane, lovely picture, very interesting observation!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Thank you for the comments. I've only just come across this website and it looks great. Looking forward to posting more oddities and helping identify others.
And if you are interested in oddities, here's one I found earlier:
Fasciated Picris hieracioides (Hawkweed Oxtongue)
Yes, I'd definitely class that as odd (technical definition). Not sure how common this sort of thing is.
Lat/Lng: 52.7, -0.3
OS grid ref: TF2115