BRIEF DESCRIPTION: The following is largely based on the original description (Wood 1997).

The cap of Amanita roseolamellata is up to 100 mm wide, pallid gray to mouse gray, rounded convex to flattened convex, finally plane, smooth dry, with a striate margin (Wood's illustration shows the striations as rather short). The volval remains are often absent; when present, volva remains are flat, thick, membranous scales, pale dull cream. The flesh is extremely thin at the margin.

The gills are narrowly adnate to free, thin or a little thick, fairly crowded, pale pink to shell pink, with a slightly paler, occasionally slightly darker edge. The short gills are present in at least one or two series.

The stem is up to 150 × 15 mm, cylindric, smooth, white with vague pink tint. The ring is membranous, skirt-like, firm, off white to pallid pinkish, striate above, sometimes breaking and falling away. Shown as rather narrow in Wood's illustration. The base is not swollen or only slightly so. The saccate volva is large, white, membranous, and persistent.

The spores measure (9.6) 9.9 - 12.6 × 6.3 - 9.0 µm and are ellipsoid, infrequently elongate and inamyloid. Clamps are present at bases of basidia.

Wood describes the mushroom as occurring in sclerophyll forests and "tall open forests" from the stated 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).