This DNA-finding technology is a powerful new way to look at what's around us. I heard recently that this technique has shown, for instance, DNA of the fungal kingdom being part of the community of life in sea floor sediments!

Since molds, yeasts, and other fungi normally grow either as solitary cells or in networks of fragile microscopic threads (some of which occasionally build themselves great skyscrapers called mushrooms to catch breezes or attract animals to help spread their spores) I don't see how we ever could have found delicate marine fungi by looking, even with electron microscopes.