Amanita flavipes - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita flavipes
name status nomen acceptum
author S. Imai
english name "Asian Yellow Dust Amanita"
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  • Amanita flavipes, Yunnan Prov., China.Amanita flavipes, Yunnan Prov., China.

    1. Amanita flavipes, Yunnan Prov., China.

    • cap

    The fruiting bodies of A. flavipes are small to medium-sized.  The cap is 30 - 120 mm wide, convex to applanate, yellowish to yellow to yellowish brown to brownish orange, darker in the center, paler towards the margin, sometimes with grayish tints.  It is covered with yellowish to yellow to yellowish white, occasionally whitish, floccose, felty, granular volval warts; its context is white to whitish.

    gills

    The gills of this species are free to subfree, crowded, white to yellowish; and the short gills are attenuate and of diverse lengths.

    stem

    The stipe is 40 - 150 × 5 - 20 mm, subcylindrical to attenuate upwards; its surface is white to yellowish to yellow, covered with yellowish to yellow squamules, and glabrescent; the stipe's basal bulb is 15 - 40 mm wide, subglobose to ovoid to ventricose, with the upper part covered with yellowish, farinose to granular volval remnants in a few concentric belts.  The annulus is membranous and superior with its upper surface yellow to yellowish to cream and lower surface yellowish to yellow.

    The species occurs in conifer forest or in forests with oaks and conifers.

    spores

    Spores [East Asian] measure (6.5) 7.0 - 9.0 (10.0) × (5.0) 5.5 - 7.0 (8.5) µm and are broadly ellipsoid to ellipsoid and amyloid.  [South Asian spore measurements are as follows: (6.0-) 6.8 - 8.5 (-11.0) × (5.0-) 5.2 - 6.5 (-8.8) µm.]  Clamps are not present on the bases of basidia.

    discussion

    Amanita flavipes was originally described from Japan.  The species is widely distributed in China, India, Japan, Pakistan, and South Korea.

    For comparison, see A. elongata Peck, Amanita erythrocephala Neville, Poumarat & Aste, A. flavoconia G. F. Atk., and A. flavoconia var. inquinata Tulloss, Ovrebo & Halling.

    L. F. Zhang, J. B Yang and Zhu L. Yang (2004) recently published molecular evidence that Amanita flavipes comprises a number of genetic clades that have macroscopic differences such as pigmentation as well as differences first detected on the molecular level.  The reader may wish to reference the discussion following the description of A. strobilaceoides A. E. Wood.—Zhu L. Yang and R. E. Tulloss

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