Hi there fellow grower. Mycorrhizal fungi are critical members of the plant microbiome, forming a symbiosis with the roots of most plants on Earth. Most plant species partner with either arbuscular or ectomycorrhizal fungi, and these symbioses are thought to represent plant adaptations to fast and slow soil nutrient cycling rates. I believe that mushroom is telling you that you have very healthy soil. I think it is so cool to be seeing this in this photo! Botrytis is a genus of anamorphic fungi in the family Sclerotiniaceae. Botrytis (also known as grey mold) belongs to the group hyphomycetes and has about 30 different species. ... It is a common outdoor fungus and can be detected in spore trap samples. The fungus is often found growing on indoor plants. This mushroom does not belong to any bad or concerning species of fungi. Hope this was helpful!! Happy growing! ✌️