BRIEF DESCRIPTION: Much of the macroscopic information in the following is from (Bas, 1969).

The cap of A. singeri is 40 - 70 mm wide, appendiculate, incurved to decurved, with a nonstriate margin; it is sordid yellowish gray. The flesh is white. The volva is present in several squamules and is adnate.

The gills are yellowish to pinkish, moderately crowded, free, and broad. The short gills are attenuate.

The stem is 30 - 50 x 7 - 12 mm, slightly enlarged at apex, narrowning downward, slender, radicating, with white flesh. The volva is present as several faint, concentric rings around the bulb below its widest point.

The spores measure (6.0-) 7.5 - 11.0 (-15.4) x (4.5-) 4.9 - 7.5 (-9.5) µm and are broadly ellipsoid to ellipsoid and amyloid. Clamps are present at the bases of basidia.

The species was originally described from Argentina, in areas planted with imported plants. The species appears to be native to Mediterranean Europe or to the Mediterranean region in general.

Amanita singeri is a species of Bas' stirps Vittadinii within Amanita subsection Vittadiniae Bas. Two other European taxa of this subsection are A. codinae (R. Maire) Singer and A. vittadinii (Moretti) Vitt. For more information about other closely related taxa, see the latter.
-- R. E. Tulloss