Cap 50-70 mm broad, convexto plano-convex, often shallowly depressed, glabrous, subviscid, evenly colored white to grayish white or more often radially marbled (marmorate) gray to pale grayish brown. Gills free, close, broad, white. Stem 40-80x5-12 mm, gradually enlarged downward to a bulbous base, dry, fibrillose, white, with a large, pendulous, membranous white annulus near the apex. Volva saccate, thin to thick, white, persistent. Spore Deposit white. Edibility: deadly poisonous.
Amanita marmorata is mycorrhizal with Eucalyptus and other members of the myrtle family introduced to Hawai‘i from Australia, including Melaleuca, the bottlebrush or paper- bark trees so popular in landscaping. This fact was made apparent when hundreds of fruiting bodies of this species appeared in a section of the National Botanical Garden on Kaua‘i featuring various myrtle trees native to Australia. Amanita marmorata is deadly poisonous if ingested. As little as one bite of a cap could be fatal to an adult (see section on Poisonous Mushrooms). Is: HA, KA, LA, MA, MO, OA.