The fruit bodies (mushrooms) are white, small to medium-sized with caps up to 7 cm (2.8 in) in diameter, a somewhat friable ring and a firm volva.

Zhu-Liang Yang and Tai-Hui Li discovered the species by reexamining various herbarium specimens of white Amanita typically referred to as either A. verna or A. virosa.

alba A. virosa A. bisporigera A. fuliginea A. hemibapha In 2005, Zhang and colleagues performed a phylogenetic analysis based on the ITS sequences of several white-bodied toxic Amanita species.

Species of this section share the following characteristics: spores that are not strongly elongated, and never with a cylindrical shape; flesh not reddening upon bruising; lamellulae (short gills that do not reach the edge of the cap) abruptly cut off; a well-formed pouch- or sac-like membranous volva.

The volva is limbate (has a distinct edge), thin, membranous, with free limb up to 7 millimetres (1⁄4 in) in height, and both surfaces are white.

They are hyaline (translucent) and colorless, amyloid (absorbing iodine when stained with Melzer's reagent), thin-walled, smooth, and have a small apiculus.

The new compound was determined to be toxic in the brine shrimp lethality test, but it did not have cytotoxic activity against a variety of human cancer cell lines.

As Bhatt et al. explain, the material collected by Dhanchiola in Odisha and identified as A. virosa[7] has two-spored basidia, and his description matches that of A. exitialis.

[8] Field observations suggest that the mushroom associates mycorrhizally with the plant Castanopsis fissa, a deciduous tree found only in the southern provinces of China, such as Guangdong, Yunnan and Hunan.

[9] The content and distribution of the main amatoxins (alpha-amanitin, beta-amanitin) and phallotoxins (phallacidin, phallisin, phalloin, phalloidin) in the three tissues (cap, stipe and volva) of Amanita exitialis have been determined using high-performance liquid chromatography.

[3] Toxic peptides from Amanita species have been widely used in biological research as chemical agents to inhibit RNA polymerase II, an enzyme essential for protein synthesis.

Although the toxin concentration in the mycelium is only about 10% of that in fruiting bodies, the authors suggest that is possible to increase the amatoxin production by optimizing the growth conditions.