The following is largely based on the original description (Wood 1997).
The cap of Amanita basibulbosa is up to 85 mm wide, convex then plane, smooth somewhat innately radially
fibrillose, dry, pale gray, with a nonstriate margin. Volval remains are present as abundant conical warts, pyramidal at the center, smaller
towards the margin, sometimes absent with age, and gray, darker than the cap.
The gills are free, crowded, thin, white to pale cream, with a concolorous edge. The short gills are present
in at least two series.
The stem is up to 130 × 10 mm, white, with finely granular surface in the lower part. The ring is persistent, membranous, white, and
striate above. The bulb is globose and prominent, not abrupt, white, with several rings or
zones of volval material at approximately the point where the stem widens into the bulb.
The spores measure (7.1-) 8.4 - 9.6 (-10.6) × (6.8-) 7.4 - 9.6 µm and are subglobose to broadly ellipsoid and amyloid. Clamps are
present 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
In using Bas' (1969)
keys, the present species can certainly be placed with confidence in Amanita subsect. Solitariae Bas; within that subsection, it is,
perhaps, most similar to taxa of stirpes Virginea and Daucipes.
Stirps Virginea is defined in part as having warts comprised almost entirely of inflated cells that somehow bind tightly to each
other without interweaving hyphae. In stirps Daucipes, inflated cells dominant the tissue but there are filamentous hyphae noticeably
present. The volva of A. basibulbosa is described as dominated by
inflated cells with some filamentous hyphae. The illustration of Wood
chooses to emphasize the presence of hyphae to the degree that they seem equally plentiful with the inflated cells. The situation requires
revision of the original material. In an exchange with our co-editor, Dr. Zhu L. Yang, he advised that we not try to draw too many conclusions
from the presently limited available data.—R. E. Tulloss and L. Possiel
A. E. Wood. 1997.
Austral. Syst. Bot. 10: 813, fig. 47(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.