Amanita clarisquamosa - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita clarisquamosa
name status nomen acceptum
author (S. Imai) S. Imai in E.-J. Gilbert
english name "Larger-Spored East Asian Amidella"
images

  • 1. Amanita clarisquamosa, Yunnan, China.



  • 2. Amanita clarisquamosa, Yunnan, China.

    • cap

    The fruiting bodies of A. clarisquamosa are usually medium-sized to large. The cap is 40-100 mm wide, convex to applanate, dirty white to yellowish brown to brownish, with an appendiculate and shortly striate margin; it is covered with brownish to grey-brown, patch-like volval remnants; its context is white, unchanging or barely changing.

    gills

    The gills of this species are free to subfree, crowded, white to cream-colored but become greyish, grey brown to chocolate brown when dried; and the short gills are truncate and of diverse lengths.

    stem

    The stipe is 60 - 130 × 10 - 20 mm, subcylindrical to attenuate upwards; its surface is white to dirty white and covered with grey-brown furfuraceous to floccose squamules; the stipe base is not enlarged and basal bulb is not present. The volval remnants form a sac at the base of the stipe; the outer surface of the sac is white to dirty white, and the inner surface is dirty white. The annulus is superior and fugacious.

    spores

    Spores measure (9.5-) 10.0-13.5 (-14.0) × (5.5-) 6.0-7.0 µm and are ellipsoid to long ellipsoid and amyloid. Clamps are not present on the bases of basidia.

    discussion

    Amanita clarisquamosa was originally described from Japan. It also occurs in China. It grows in mixed forests with broad-leaved trees and conifers.

    Amanita clarisquamosa is very similar to A. avellaneosquamosa (S. Imai) S. Imai and A. volvata (Peck) Lloyd. However, A. clarisquamosa differs from A. avellaneosquamosa by its shorter striations on the pileal margin, more densely arranged lamellae and larger spores. The fruit-body of A. volvata becomes reddish brown when cut, and has much thicker subhymenium consisting of 3-4 layers of cells and somewhat smaller spores. Furthermore, the inner layer of the volval remnants consist of a large number of loosely arranged, fusiform, broadly clavate to ellipsoid inflated cells.—Zhu L. Yang

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