The following is largely based on the original description (Wood 1997).
The cap of Amanita
alboverrucosa is up to 130 mm wide, off-white to grayish buff or pallid cream-gray, convex then plano-convex or plane,
smooth, dry, with a nonstriate and appendiculate margin. Large, prominent pyramidal
warts are present on the cap, smaller towards the margin, white to cream, discoloring a little with age.
The gills are free, crowded, thin, white to pale cream, with a concolorous
edge. The short gills are present in at least one series.
The stem is up to 150 × 20 mm, white to pale
cream, smooth to finely fibrous to decorated with some scales of the
volva. The ring is membranous, skirt-like,
persistent (occasionally fragile), white to cream, and not striate above
or only slightly so. The bulbous base of the stipe is rounded or slightly top-shaped,
and white to off-white. A few conical warts or a few concentric bands of
fibers appear on the top of the bulb, occasionally these volval fragments become slightly yellow.
The spores measure (8.7-) 9.6 - 11.7 × (6.4-) 7.1 - 9.3 µm and are broadly ellipsoid and amyloid. Clamps are easily
distinguished but irregularly distributed at bases of basidia.
Wood describes the mushroom as occurring in sclerophyll forests, "tall open forests," and under Allocasuarina 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).
Wood places the present species in Bas' stirps Ravenelii but fails to provide sufficient information about the volva to justify
his choice. If the elements of the volva have a distinctly vertical orientation in the warts and have a largely hyphal base including rather
frequent yellowish and refractive hyphae then stirps Ravenelii could be appropriate. If such a base layer of the warts is not present there are
a number of other possibilities depending on the orientation of the elements within the warts Therefore we refrain from assigning this
species to a specific stirps in Bas' system.
—R. E. Tulloss and L. Possiel
A. E. Wood. 1997.
Austral. Syst. Bot. 10: 779, fig. 29(a-e).
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The following text may make multiple use of each data field.
The field may contain magenta text presenting data from a type study
and/or revision of other original material cited in the protolog of the present taxon.
Macroscopic descriptions in magenta are a combination of data from the protolog and
additional observations made on the exiccata during revision of the cited original
The same field may also contain black text, which is data from a revision of the present
taxon (including non-type material and/or material not cited in the protolog).
Paragraphs of black text will be labeled if further subdivision of
this text is appropriate.
Olive text indicates a specimen that has not been
thoroughly examined (for example, for microscopic details) and marks other places in the text
where data is missing or uncertain.
The following material is based entirely on the protolog of this species, which does not meet contemporary standards for Amanita taxonomy.
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
and explanations prepared for this site talk about specimen-observer pairs associated with each data set.
Combining more data into a single data set is non-optimal because it obscures observer differences
(which may be valuable for instructional purposes, for example) and may obscure instances in which
a single collection inadvertently contains a mixture of taxa.