BRIEF DESCRIPTION: The following description is based on the original description by Vassilieva (1950).

The cap of A. caesareoides is 100 - 140 mm wide, ovate at first, becoming planar, with a large broad umbo, orange-vermilion, with a strongly and long-striate margin.  The flesh is white, thin, about 3 mm thick above the stem.

The gills are free, crowded, about 10 mm broad, pallid ochraceous-yellow.

The stem is 190 mm long, ochraceous-yellow, and stuffed.  The ring is concolorous with the stem, membranous, and skirt-like.  The volva is free, yellow on the inner surface, and white on the outer surface.

The spores measure 8 - 10 × 7 µm and are broadly ellipsoid and inamyloid.  Spore measurements from the type collection (combined data of RET and Dr. C. Bas) are as follows: (7.0-) 7.5 - 9.5 (-12.0) × (6.2-) 6.4 - 7.7 (-8.5) µm and are subglobose to broadly ellipsoid to ellipsoid, rarely globose.  Clamps are present at the bases of basidia.

This species was originally described from a young oak forest on the Kamchatka Peninsula, Russia.

This species is assigned to stirps Hemibapha.  It is the species commonly called A. hemibapha (Berk. & Broome) Sacc. in Japan, Korea and other countries of north or northeastern Asia.  Amanita caesareoides is very similar to Amanita jacksonii Pomerleau of eastern North America and Central America.  There is a difference in spore shape; however, the difference may be dependent upon the available, limited samples and not be a true representation of the facts.  The two species are certainly sister taxa.  It will be very interesting to see the results of a comparative molecular study.