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

The cap of Amanita elongatispora is up to 60 mm wide, convex then flattened convex, smooth, appearing slightly silky, dry, pale gray-brown to gray-brown, with a nonstriate margin [possibly appendiculate?].  Volval remains are present as scattered, submembranous warts, flat, pale gray to buff-gray.

The gills are free, moderately thick, crowded, cream, with a concolorous margin.  The short gills are present in at least two series.

The stem is up to 110 × 13 mm, white to cream, smooth to slightly fibrillose, narrowing downward toward the bulb, with a narrowly radicating, spindle-shaped bulb.  The ring is submembranous, cream, somewhat persistent or fragile.  [The ring is so small it is barely noticeable in Wood's illustration.]  The bulb is white to cream and has, on its upper part, a series of fibrillar zones that may be missing in some specimens.

The spores measure 9.0 - 11.1 × 4.4 - 5.8 µm and are elongate to cylindric and amyloid.  Clamps are scattered and often small at bases of basidia.  [Note: Wood's unusual use of Bas' terms for spore shape is particularly noticeable with regard to this species.  If the average ratio of length to width of a spore is 1.98 then surely nearly half the spores must have had a length-to-width ratio of 2 or greater, hence calling the spores "elongate" significantly misrepresents the spore shape by omitting the fact that nearly half the spores are cylindric. Readers of Wood's (1997) work on Australian Amanitas should be aware that he is apparently only presenting average values of Q where most researchers of amanitas provide raw data (for example, a range of values of Q) as well.]

Wood described this species from New South Wales, Australia, as occurring in "moist hardwood forests" and Angophora costata woodland. The genus Angophora (Myrtle family) is a close relative of Eucalyptus and is often included under the informal term "eucalypt" (wikipedia).

Wood places the present species in section Validae although he gives no reason for it.  Species of section Validae almost always, so far as is known, have a subhymenium (cells which support the basidia) comprised of inflated cells, comparatively short basidia, the presence of a membranous and persistent ring on the stem, and none of the species that have been assigned to section Validae previous to Wood's work have clamps on the basidial bases.  Therefore the present taxon seems most appropriately placed in section Lepidella. The fact that Wood considers A. griseoconia D. A. Reid (another species Wood places in section Validae instead of section Lepidella) as a very similar species supports the above view.

Within section Lepidella and considering Bas' (1969) key to his stirpes of subsection Solitariae, the closest match for the present species is with stirps Chlorinosma--a group that currently contains taxa from the Americas and central Africa.