Amanita alboflavescens - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita alboflavescens
name status nomen acceptum
author Hongo
english name "East Asian Yellow-Staining Lepidella"
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  • Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.

    1. Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.

  • Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.

    2. Amanita alboflavescens, Chuxiong Yi Auton. Pref., Yunnan Prov., China.

    • intro All parts of this species including the flesh are white at first and will stain yellow when cut or bruised. Bruised areas appear to become brownish orange or orange-brown with further lapse of time. In this discoloring, A. alboflavescens is reminiscent of supposedly "diseased" specimens of A. subsolitaria (Murrill) Murrill of North America (in Bas' stirps Rhoadsii) a North American yellow staining entity, with older stained areas becoming orange-brown.

    The macroscopic description is largely based on Hongo's original description, supplemented with some data from Arora's collection.
    cap The cap of Amanita alboflavescens is 40 - 100 mm wide. The cap margin is not striate and is appendiculate. The volval remains on the cap are floccose-membranous and arrayed in flat patches.
    gills The gills are free to subdecurrent, subdistant to sub crowded, white to cream before bruising or cutting, and 5 - 7 mm broad. The gills' edges are farionose. The short gills are truncate.
    stem The stem is 50 - 70 × 8± mm, pruinose near the apex, floccose-squamulose below the annulus, and soid. The annulus is superior, rather thick, floccose-membranous, striate on its upper surface, and friable. The stem has an obovate to somewhat somewhat radicating bulb at its base. In some specimens the bulb is only slightly wider the the stipe above it. The floccose-membranous volva is evanescent although it may be present at times as a flaring or collapsed limb.
    spores The spores from Arora's rather large Chinese collection measure (7.7-) 8.0 - 10.3 (-11.0) × (3.6-) 4.0 - 5.5 (-6.0) µm and are amyloid and elongate to cylindric (occasionally ellipsoid), sometimes constricted, sometimes narrowly clavate. Yang (1997) reported spores from another Chinese specimen as (7.5-) 8.0 - 10.5 (-11.5)× (4.5-) 5.0 - 6.0 µm. Yang and Doi (1999) reported the spores from the (Japanese) type collection to be 8.0 - 11.0 (-13.0) × (4.0-) 4.5 - 5.5 (-6.5) µm. Clamps are not found at the bases of basidia.
    discussion

    This species was originally described from Japan (Hongo, 1970); and, hence, was not treated in Bas' 1969 study of section Lepidella. Its currently known range includes part of southern China.

    In China and Japan, the species is associated with pine and oak as well as other fagaceous trees.

    Because the present species lacks clamp connections, it cannot be closely related to A. subsolitaria (=A. crassifolia Bas nom. prov.) because the latter is classified in a group of clamp-bearing taxa by Bas.—R. E. Tulloss

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