I watch people walk by. Very few notice the mounds of yellow mushrooms that have appeared on or near the sweetgum (Liquidambar styraciflua) stump. One day, these fungi just showed up, seemingly from nothing. But there IS something. Underground. Unseen. A network of microthin filaments. These fungal filaments grow within and into and between roots, rocks, soils and other microbes. They may have been growing there for years. Why I think this is cool – Scientists are still making huge discoveries about fungi. There is much we don’t…