Amanita augusta - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita augusta
name status nomen acceptum
author Bojantchev & R. M. Davis
english name "Majestic Amanita"
images

  • 1. Amanita augusta, holotype, Salt Point St. Pk., Sonoma Co., California, U.S.A.


  • 2. Amanita augusta, ?? Co., California, U.S.A.


  • 3. Amanita augusta, ?? Co., California, U.S.A.



  • 4. Amanita augusta, Joaquin Miller Park, Oakland, Alameda Co., California, U.S.A.

    • intro This information is derived from the original description of this species.
    cap The dark brown to yellow-brown cap is 30-150 mm wide and is usually palest toward its edge.  The cap is hemispheric to convex while young and flattens out with age.  The cap’s flesh is white to pale yellow.  The cap’s edge sometimes curves inward and is occasionally lined or ribbed.  Volval material may be absent or, if present, forms concentric rings of easily removed yellow warts that become smaller towards the cap's edge and gray with age.
    gills The crowded white gills are attached to free and may become yellow toward the cap’s edge.  Short gills are common.
    stem The cylindrical 40-150 x 10-30 mm stem is yellow when young, especially above the ring, and fades to white with age.  Above the bulb, the stem surface may form horizontal cracks and curving scales that have yellow edges.  The stem is longitudinally lined above the ring.  The prominent bulb turns reddish brown as it ages.  The stem’s flesh is white to pale yellow.  The membranous, pale yellow ring is positioned toward the top of the stem.
    spores The spores measure 9.5 - 12.4 × 6.6 - 7.9 μm, and are amyloid and ellipsoid to elongate.   Clamps are absent at the bases of basidia.
    discussion The present species was described from California (sea level to 2550m elevation) in association with Lodgepole pine (Pinus contorta).

    It was formerly called A. franchetii sensu Thiers.  the authors of the present species established that A. augusta is quite distinct from the European A. franchetii.—N. Goldman and R. E. Tulloss
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