The cap of A. boliviana is 25 - 45 mm wide, convex to plano-convex, white, dry, with a nonsulcate margin. The cap is minutely pulverulent-squamulose with small, white, floccose patches and flecks. The cap's flesh is white and unchanging.
The gills are crowded, free, and white.
The stem is 70 - 100 × 6 - 10 mm, solid, firm, white, floccose-scabrous, exannulate, and without distinct remnants of volva. The stem's flesh is white and unchanging.
Nothing is know of the odor and taste of this mushroom.
The spores measure (7.5-) 8 - 9.5 × 6.5 - 7.5 (-8.5) µm and are amyloid and subglobose to broadly ellipsoid. Clamps are present at bases of basidia.
Due to lack of information on fresh material, Bas described this entity provisionally from Bolivia (Dpto. Pando). Its habitat was described simply as "forest."
Bas placed this species in his stirps Vittadinii. Many taxa of that stirps appear to grow without a woody plant symbiont. Amanita boliviana may be an exception.—R. E. Tulloss
Bas (1969): BOLIVIA:
DPTO. PANDO—Cobija [ca. 11°01'15" S/ 68°45'48" W, ca. 217 m], 1.ii.1948 E. J. H. Corner Bol. 9 (L).
Bas (1969): "The collection studied consists of two dried, longitudinal slices of a stem and one very thin, radial slice of a cap accompanied by field-notes and a rough pencil-drawing. The tissues are difficult to study. For these reasons the collection is unsuitable for a type.
"Although the collection studied is very poor, sufficient data are known to be sure that it represents a species closely related to A. lilloi or perhaps even a form of that species. For the moment it seems expedient to keep this fungus apart under a provisional name because of the following facts: (i) The macroscopical aspect of the covering of the cap as noted in the field by Corner (minutely pulverulent-squamulose with small, floccose patches) is rather different from that in A. lilloi (with distinct, about 3-5 mm high, floccose warts). (ii) The stem of A. boliviana is exannulate; A. lilloi has a very distinct ring. (iii) The spores of A. boliviana are slightly larger than those of A. lilloi, viz. (7.5-) 8 - 9.3 × 6.5 - 7.5 (-8.5) μm against 7 - 8.5 × 6 - 7 (-7.5) μm."
The following figure provides the comparison of current sporographs for the two taxa named by Bas, above:
The sample of spores from material determined as A. lilloi has advance in the forty years since Bas' publication; however, no new information on A. boliviana has become known to us. There appears to be less difference in size and shape between the spores of the two species than was evident to Bas in 1969.
—R. E. Tulloss
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1. Amanita boliviana
Dr. Cornelis Bas (1969) (reproduced by courtesy of Persoonia, Leiden,
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.