What is this close-up picture? (WotsThat: Chestnut shell texture (macro))

Question

What object is shown in this zoomed-in close-up photo?

PixelLynx · Accepted Answer

Chestnut shell texture (macro). The spiky outer case of a sweet chestnut is called a bur, covered in dozens of sharp spines specifically to deter animals from eating the nut before it's ripe enough to fall and germinate.

Answer: Chestnut shell texture (macro)

More plant close-ups