Amanita avellaneosquamosa - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
[print] [map]
name Amanita avellaneosquamosa
name status nomen acceptum
author (S. Imai) S. Imai in Ito
english name "Smaller-Spored East Asian Amidella"
images
  • Amanita avellaneosquamosa, from Japan.Amanita avellaneosquamosa, from Japan.

    1. Amanita avellaneosquamosa, from Japan.

    • intro The following is based in part on the revision of this species by Yang (1997).
    cap The fruiting bodies of A. avellaneosquamosa are small to medium-sized.  Its cap is 40 - 80 mm wide, convex, then plano-convex.  It is white, whitish to dirty white.  Its margin is radially striate (with striations extending 15% to 30% of the cap radius), and appendiculate especially in young stages.  The volval remnants on the cap are brownish to brown, patch-like to felty, and up to 2 mm thick.  The context is white and unchanging in color.
    gills The gills of this species are free, crowded, white to cream-colored when fresh, but often become grayish, gray-brown, brownish, or chocolate-brown when dried.  The short gills are squarely cut-off or nearly so.
    stem The stem is 70 - 120 mm long and subcylindric or slightly tapering upward, with the very top of the stem slightly expanded.  The stem is 8 mm wide at the very top and 20 mm wide near the base.  It is white to whitish, with white, powdery scales.  Its flesh is white and unchanging.  There is no basal bulb on the stem.  The volva is saccate, membranous, rather firm, with a free limb 20 - 40 cm in height.  The outer surface of the volva is dirty white, and the inner surface is white.  The ring is fragile and easily broken; often, it is only visible as farinose squamules on the upper part of the stem.
    odor/taste The odor is indistinct.
    spores ZLY's data from spore measurements are (8.0-) 9.0 - 11.0 (-12.0) × 5.5 - 6.5 (-7.0) µm.  The spores are mostly ellipsoid to elongate (a few are broadly ellipsoid or cylindric) and amyloid.  Clamps are not found at the bases of basidia.
    discussion This species is known to occur in association with pine, fir, beech, and chinkapin. The species was originally described from Japan.  It is relatively common in many parts of China.

    In Asia, see also A. clarisquamosa (S. Imai) S. Imai in E.-J. Gilbert, and A. duplex Corner & Bas.  Many references to A. volvata (Peck) Lloyd or A. peckiana Kauffman in the Asian literature refer to one or both of the two species originally named by Imai.—Z.-L. Yang
    brief editors RET

    [top]