Amanita altipes, also called Yellow Long-Stem Amanita, is a species of agaric found on soil in coniferous (Abies, Picea) and broadleaved (Betula, Quercus, Salix) woodland in southwestern China up to an altitude of 4000 m. The name 'altipes' means 'referring to the long stipe', and it suits the species as it has longer stems compared to its relatives.
This is a small to medium-sized agaric with a distinctively yellowish overall coloration. The other physical characteristics are as follows:
Cap : The cap has a diameter of up to 9 cm and is yellow, often brownish towards the centre. The appearance of the cap may be convex to plano-convex. The volva is present as felty, floccose patches, 2 – 5 mm wide and up to 1 mm thick. Unlike many of its relatives (for example, the Amanita pantherina), the remnants of the universal veil do not usually persist on the cap, being easily washed away by rain.
Stem/Stipe : The stem is relatively long (up to 16 cm) and yellowish and usually tapers upwards. There is a large persistent ring.
Gills : The gills are free, crowded, and white to cream-colored to yellowish . The short gills are truncate, numerous, and are evenly distributed.
Spores and microscopic features : The spores measure 8.0 - 10.0 x 7.5 - 9.5 µm and are globose to subglobose and inamyloid. There are no clamps present at the bases of basidia.
This species is widespread in southwestern China mostly in Yunnan as discussed before. It has also been reported that it is found in eastern Himalayas and adjacent regions. It grows on soil in coniferous (Abies, Picea) and broadleaved (Betula, Quercus, Salix) woodland in southwestern China up to an altitude of 4000 m.
^Zhang L., Yang J.; Yang Z. "Molecular phylogeny of eastern Asian species of Amanita (Agaricales, Basidiomycota): taxonomic and biogeographic implications". Fungal Diversity (PDF|format= requires |url= (help)). 17: 219–238.