Amanita umbrinidisca - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
[print] [map]
name Amanita umbrinidisca
name status nomen acceptum
author (Murrill) Murrill
english name "Dark-Eyed Panther"
images
  • Amanita umbrinidisca, Seattle, King Co., Washington, U.S.A. Original notes on type collection by W. A. Murrill.Amanita umbrinidisca, Seattle, King Co., Washington, U.S.A. Original notes on type collection by W. A. Murrill.

    1. Amanita umbrinidisca, Seattle, King Co., Washington, U.S.A. Original notes on type collection by W. A. Murrill.

    • intro

    Based on the original description of Murrill (1912) and type study by David T. Jenkins (1979).

    cap The cap of A. umbrinidisca is up to 100 mm wide, yellowish with umbo turning umbrinous in age, honey-like color fading to straw-color on the conspicuously long striate margin, very thin, convex to plano-convex, umbonate, in age the umbo sits in a depression, yellow colored with umbo turning umbrinous in age, honey-like color fading to straw-color on the conspicuously long striate margin. The volval remnants are large, irregular, white patches.
    gills

    The gills are free, not crowded, broad and white.  Short gills are truncate.

    stem

    The stem is up to 120 × 10 - 20 mm, narrowing upward,  hollow, white or slightly yellowish.  The ring is ample, white, persistent, attached above the center of the stem. The volva is white, tough, short, and ocreate. The bulb on the base of the stem is 30 mm wide.

    spores The spores measure 10.2 - 11.7 × 7.0 - 8.0 (8.6) µm and are ellipsoid and inamyloid. Clamps are absent at bases of basidia.
    discussion

    Originally described from the state of Washington, USA, from fir forests.

    The inamyloid spores and striate pileus margin definitively contradict Murrill's belief that this species belongs in Amanita sect. Phalloideae. Jenkins (1986) placed the species in what is now called sect. Caesareae; however, examination of the type shows that there is a distinct bulb and that the species belongs in sect. Amanita. The absence of clamps suggests the possibility of a relationship to Amanita pantherina DC. : Fr.) Krombh. although the thin cap flesh suggests the relationship is not very close.—R. E. Tulloss

    brief editors RET

    [top]