This text is derived from the original
description of Amanita olivaceofusca.
The fruiting bodies of Amanita olivaceofusca are small.
The cap is 20 – 45 mm wide,
plano-convex to planar,
dark brown to gray-brown in the
center, gradually changing towards
the margin to yellow-brown to brown.
The cap’s margin is radially grooved for 20%
to 50% of the cap's radius. There is not 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 60 – 140 × 3 – 6 mm,
nearly cylindrical or narrowing upwards,
white to dirty white, covered with minute,
concolorous fibrils or floccules. The stem
lacks a basal bulb. At the stem's base,
the volva is saccate, 15 – 25 × 8 – 15 mm,
membranous, both surfaces are white.
The odor and taste of the present species were not recorded.
The spores measure 10.5 – 13.0 × 8.5 – 10.0 µm and
are broadly ellipsoid to ellipsoid and
inamyloid. There are no clamps at the
bases of basidia.
Amanita olivaceofusca is described from
Yunnan Province, China. It is associated
with broad-leaved trees in tropical to
Amanita angustilamellata (Höhn.) Boedijn
can be easily confused with A. olivaceofusca
because of its slender fruiting body
and tropical to subtropical distribution,
but A. angustilamellata has a relatively
larger fruiting body, a darker colored cap
and globose to subglobose spores
(Q = 1.0 - 1.05 (-1.13).—Yang-Yang Cui and
Yang-Yang Cui, Qing Cai, Zhu L. Yang in Cui et al.
Fungal Diversity 91(1): 70. figs. 22a-b, 23.
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).
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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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