Across 28 orchid species in Japan’s Ryukyu Archipelago, researchers identified 57 orchid-associated fungal groups, including 6 generalist fungi that each partnered with more than 10 orchid species. Most associations belonged to the fungal family Tulasnellaceae, and the orchids showed remarkably low specialization, sharing many of the same underground fungal partners across habitats and islands. A small group of versatile fungi appears to support entire orchid communities, making them promising targets for orchid conservation and restoration efforts.