Cap 70-120 mm broad, at first hemispherical, becoming broadly convex then flattened in age. When young covered with a thin, smooth, brown to pinkish-tan skin that breaks up as the cap expands to form concen- tric brown scales on the disc; remainder of cap white. Gills free, crowded, broad, at first off-white but soon becoming grayish green. Stem 80-140 (-200) x 8-15 mm, cylindrical with a bulbous base, fibrous, white to pale grayish brown, with a large, membranous annulus near the apex that becomes free and movable in age; stem flesh staining red where bruised. Spore deposit olive to green. Edibility: poisonous.
The Green-spored Parasol grows on lawns after rains or heavy lawn watering. Look for them on golf courses, school yards, public parks, and pastures. The large cap size (as big as a salad plate) and the presence of brown scales on the cap (somewhat like corn flakes) are diagnostic characteristics. These large, elegant mushrooms have tempted a number of people to toss them in the pot for dinner. But watch out, this species is poisonous to most and sends a number of people to the emergency ward each year with deposit to Chlorophyllum acute gastrointestinal upsets (see section on Poisonous Mushrooms). This species looks very similar to the edible Shaggy Parasol, Macrolepiota racbodes, which does not occur in Hawai‘i. The latter species differs from Chlorophyllum in having white instead of green gills and spores. For additional photos, see Pastures and Coastal Casuarina. Is: HA, KA, MA, OA.