Gills

The gills are a membrane that surrounds the hymenium. In fungi such as button mushrooms and fly amanitas, the ring is a remnant of the hymenium that bursts when the cap falls off.

Sources

1. Britannica – hymenium – fungus tissue 
2. Unsplash – Photo of mushrooms 

April 2023, TÄNKOM | Revised February 2024 RETHINK