Introduction to Fall Mushrooms
by Michael W. Beug Email:
The Evergreen State College, Olympia WA
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Slide 32.
Marasmius oreades is a good edible white-spored species known as the Fairy Ring Mushroom, though there are many other mushrooms including poisonous species that grow in rings. Marasmius oreades has fairly broadly spaced off-white gills and a dry buff to dark tan cap with a broad umbo. The growing mycelium leaks nutrients and causes the grass to grow bright green. Each year the ring grows larger as it uses up nutrients and expands ever outward. Large rings observed from the air over Stonehenge have allowed mycologists to date some fairy rings to several hundred years of age.

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