Amanita longitibiale - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita longitibiale
name status nomen acceptum
author Tulloss, Pérez-Silva & T. Herrera
english name "Long Stocking Death Cap"
images

  • 1. Amanita longitibiale

    • intro

    The following is based on the original description of Tulloss, Perez-Silva & T. Herrera (1995).

    cap

    The cap of Amanita longitibiale is 38 - 100 mm wide, sometimes yellowish cream at first, eventually pale grayish brown to umbrinous with pale gray to slightly yellowish margin, unevenly hemispherical to ovoid at first, then plano-convex, often with a low umbo, subviscid, shiny when dry, with an inflexed margin at first, later decurved, then nonstriate and nonappendiculate. The volva is absent or of dispersed patches, pallid, easily removed, with pale orangish-brown or a pale and sordid orangish-brown tint.

    gills

    The gills are free or attached by a line, close, white, sometimes with a light pink tint, moderately broad to broad, with a floccose and concolorous edge. The short gills are attenuate, plentiful, and in several ranks.

    stem

    The stem is 50 - 110 × 6 - 30 mm, white, narrowing slightly upward, pruinose above the ring, furfuraceous below. The stem's bulb occupied one-third of the stem's length. It is usually rather slender, pointed below, or rooting. The flesh is white. The ring is skirt-like, flaring, membranous, copious, persistent, thin, striate on the upper surface, and superior. The volva is limbate or saccate, sometimes becoming detached from the bulb surface so it only remains attached to the bottom twenty-percent of the bulb. The volva is membranous and tough. The exterior surface sometimes having brown or rusty or pinkish tints.

    KOH on the cap is immediately orange or reddish orange.

    odor/taste As a precaution, this mushroom should be considered deadly POISONOUS.
    spores

    The spores measure (10.0-) 10.5 - 12.8 (-14.8) × (4.2-) 5.0 - 6.5 (-7.2) µm and are elongate to cylindric, rarely bacilliform and amyloid. Clamps are present (sparsely distributed) at bases of basidia.

    discussion

    Species was originally described from the neo-volcanic zone of Mexico. It is also known from North Carolina, USA. In Mexico it is found with pine and fir; in North Carolina it was found in the sandy clay of a mixed hard-wood forest.

    The reader may wish to make comparison to white-capped species such as Amanita cylindrispora Beardslee of section Roanokenses and to A. virosiformis (Murrill) Murrill.

    —R. E. Tulloss

    brief editors RET

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