Amanita albidoides

The description is largely based on the original description (Wood 1997).

The cap of Amanita albidoides is up to 90 mm wide, pale buff to buff, sometimes pallid gray-buff, convex then plano-convex, smooth, dry, slightly innately radially fibrillose, with a nonstriate and appendiculate margin.  The volval remains are present as irregular, flat, cobwebby remains, or felted to slightly membranous patches, that can be quite large, usually paler than the cap (pale white to pale gray) but sometimes concolorous.

The gills are free, broad, white to pale cream, with a white and somewhat fimbriate margin.  The short gills are present in up to two series.

The stem is up to 130 × 15 mm, expanding slightly downward, white to pale cream or occasionally pale buff, solid, smooth to finely powdery above, with sometimes slightly grayish fibrillose concentric zones below, faintly striate above the ring.  The ring is large, skirt-like, white, membranous, persistent, striate on the upper surface, sometimes becoming fragile with age.  The base is sometimes distinctly swollen (e.g., an ellipsoid bulb) or is simply clavate.  The volval remains form a soft grayish to buff fibrillose zone or band.

The spores measure 9.6 - 11.4 × (5.7-) 6.0 - 7.2 µm and are ellipsoid and amyloid.  Clamps are distinct, but infrequent, at bases of basidia.

Wood describes the mushroom as occurring in sclerophyll forests and "tall open forests" from the state of New South Wales, Australia.  A sclerophyll forest in the Australian bush is a forest of hard-leaved plants including Eucalyptus in the overstory (wikipedia).

From the evidence presented we concur with the placement of the present species in Bas' stirps Grossa.  In discussing other species in this stirps we have noted the possibility that the cap skin never truly gelatinizes and remains in connection with the volval remains throughout most of the life of the fruiting body.  This may be the case in the present species as well considering the description of cobwebby volval remains on a dry cap.—R. E. Tulloss and L. Possiel