This text is derived from the original description
of Amanita retenta. The fruiting bodies
of Amanita retenta are small to medium-sized.
The cap is 30 – 70 mm wide, plano-convex to
planar, dirty white, grayish, gray,
gray-brown to brown, occasionally pure
white. Volva is often present as large,
white patches slightly attached on the
cap. The cap’s margin is radially grooved covering
15% - 40% of the cap's radius. There is no
material hanging from the edge. The flesh is white.
The gills are free, crowded, and
white. The short gills are truncate and plentiful.
The stem is 70 – 110 × 4 – 15 mm, nearly cylindrical
or narrows upwards, white, dirty white
to brownish, covered with minute,
concolorous, snake-like squamules. The stem
lacks a basal bulb. At
the stem's base, the volva is
saccate, 10 – 40 × 10 – 20 mm, membranous, and
both the inner and outer surfaces are white to dirty white.
The odor and taste were not recorded for the present species.
The spores measure 10.0 – 12.0 × 9.5 – 11.5 µm and
are globose to subglobose and inamyloid. There
are no clamps at the bases of basidia.
Amanita retenta is described from
Yunnan Province, China. It is found in
pine or mixed forests.
Note that because there are
abundant inflated cells in the outer part
of the volva on the stem’s base, the volva
can easily be broken during the development
of the fruiting body.
Specimens of A. retenta with entirely white
fruiting bodies have also been collected in
the field. The white fruiting bodies of
A. retenta could be misidentified as
A. vaginata var. alba
Gillet. For example,
HKAS 82591 was treated
as A. vaginata var. alba by Yang
and should be a species of A. retenta based on
molecular evidence in Cui et al.
A. vaginata var. alba differs from the
white fruiting bodies of A. retenta
by the absence of patches on the cap,
and the irregularly distributed, brownish
spots on the outer surface of the volva
on the stem’s base.—Yang-Yang Cui and
Yang-Yang Cui, Qing Cai, Zhu L. Yang in Cui et al.
Fungal Diversity 91(1): 95. figs. 22h-i, 26.
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 derived directly from the
protolog of the present taxon and associated documen-
tation such as sequences deposited in GenBank.
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Yang-Yang Cui, Qing Cai & Zhu L. Yang
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