Amanita olivaceofusca - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita olivaceofusca
name status nomen acceptum
author Yang-Yang Cui, Qing Cai & Zhu L. Yang
intro This text is derived from the original description of Amanita olivaceofusca.   The fruiting bodies of Amanita olivaceofusca are small.
cap 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.
gills The gills are free, crowded, and white.  The short gills are truncate and plentiful.
stem 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.
odor/taste The odor and taste of the present species were not recorded.
spores 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.
discussion Amanita olivaceofusca is described from Yunnan Province, China.  It is associated with broad-leaved trees in tropical to subtropical forests.

Morphologically, 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 Rachel Warner
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