Goldenrod in my wet backyard has this fuzzy white stuff in clumps on it. I have never seen this before. The Goldenrod in the drier parts of the property looks normal. This is in Lake Leelanau, Michigan. Fungus? Insect? Tomorrow I will use my magnifying glass in the sunlight to see if I can tell if it is alive and moving. It looks like fuzz….not bubbles or froth.