Amanita subpallidorosea - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita subpallidorosea
name status nomen acceptum
author Hai J. Li
images

  • 1. amanita=

  • intro The following information is derived from the original description (Li et al., 2015) and a description provided by Yang (2015).  The fruiting body of Amanita subpallidorosea  is small to medium-sized. 
    cap The cap is 30 - 80 mm wide, obtusely conic when young, then convex, becoming applanate at maturity, occasionally with a noticeable umbo.  The cap is white to dirty at first; sometimes, it becomes pale rose in the center.  The cap's margin is non-striate and non-appendiculate, and its flesh is white.  No volva remains are present on the cap.
    gills The gills are free, white to whitish, crowded, and up to 4 mm broad.  The short gills are attenuate, plentiful, and in at least two to three ranks.
    stem The stem is 70 - 120 mm long, nearly cylindric, slightly tapering upward, with an apex that is slightly expanded.  The stem is 6 mm wide at the top and 14 mm wide near the base.  It is white to whitish, solid, and is decorated with finely fibrillose squamules.  Its flesh is white.   The basal bulb of the stem is subglobose and 15 - 30 mm wide.  The volva is limbate, membranous, rather firm, with free limb up to 15 mm high; both its surfaces are white.  The stem's ring is near the top of the stem and is thin, skirt-like, and membranous.
    odor/taste The odor is indistinct.  The species is deadly POISONOUS (Li et al. 2015).
    spores The spores measure (7.5-) 8 - 11 (-12) × (7-) 8 - 10 (-12) µm and are globose to subglobose and amyloid.  The basidia are clampless.
    discussion Amanita subpallidorosea grows in broad-leaved forests dominated by Fagaceae [trees of the Beech-Oak family].  It is only known from China (Guizhou and Taiwan).

    It is characterized by its small to medium-sized basidioma often with a white pileal margin and pale rose center, a subapical annulus, and large, amyloid globose to subglobose basidiospores (8.5–11 × 8–10 μm).  It differs from A. pallidorosea by its larger basidia and larger basidiospores.

    The reader may wish to compare this taxon with others that are genetically similar such as A. virosa, A. amerivirosa, A. ocreata, A. rimosa, and A. bisporigera.

    The fruiting body of A. subpallidorosea becomes yellow when wetted with 5% KOH (potassium hydroxide) solution.—Zhu L. Yang
    brief editors ZLY, RET

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