The Society for the Protection of Underground Networks (SPUN) is a science-based initiative to map and protect the mycorrhizal networks that regulate the Earth's climate and ecosystems.
The organization was founded in 2021. The Executive Director is Toby Kiers, an evolutionary biologist at the Vrije Universiteit Amsterdam. The stated goals of The Society for the Protection of Underground Networks (SPUN) are mapping, protecting, and harnessing mycorrhizal fungi.