What's a fairy ring of mushrooms? Why is it a circle?

Fairy Rings

Roadsides, ditches, meadows across Pennsylvania blooming

What is a Fairy Ring and What Causes Them? - Woodland Trust

The way these mushrooms form an almost perfect circle : r

Fairy Ring Mushrooms Growing & Mowing in Bartow County

What's a fairy ring of mushrooms? Why is it a circle?

Fairy Ring Treatment and Control (Complete Beginner's Guide)

Lawn Mushrooms and Fairy Rings

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Fairy ring - Sidney Daily News

The Complete Guide to Fairy Ring Mushrooms

Understanding Fairy Rings - Cliff Lamere

20+ Fairy Ring Mushroom Stock Photos, Pictures & Royalty-Free