Mature specimens of Chlorophyllum molybdites yield a green spore print. Young caps that yield no spores have fooled some people into thinking they had a Lepiota. However, white spores are readily apparent, as a deposit on white paper - if nothing rubs off the paper, there are no spores present. Sometimes the gills pressing on the paper can leave an imprint and even discolor the paper slightly, but no spore powder will be present and thus no spores. In the warmer, generally humid parts of North America where it grows, Chlorophyllum molybdites causes many cases of very serious gastric distress.
Children grazing in yards are frequent victims.