Eight species of Amanita from tropical lowland forests around Manaus, Brazil, are described, seven as new and one under a provisional name: A. campinaranae, A. coacta, A. craseoderma, A. crebresulcata, A. lanivolva, A. phaea nom. prov., A. sulcatissima, and A. xerocybe. Information is given on the types of Amanitopsis plumbea Rick and Collybia sulcatissima Rick, both remaining insufficiently known taxa. A very sketchy grouping of South American Amanitas on ecological grounds is discussed.