Public Description of Amanita muscaria var. guessowii Veselý

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Name: Amanita muscaria var. guessowii Veselý
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 Draft For Wild Mushrooms Of The Northeastern United States By Erlon Bailey (Private)

Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae

General Description:


The cap is 4.5–16 (18) cm wide, convex, and becomes broadly convex to flat in age. It is bright yellow or yellow-orange, usually more orange or reddish orange towards the disc, and fading to pale yellow. The volva is distributed over the cap as cream to pale tan warts; it is otherwise smooth and sticky when wet. The margin becomes slightly striate in age. The flesh is white and it does not stain when cut or injured.

The gills are free to narrowly adnate, subcrowded to crowded, cream to pale cream, truncate, unevenly distributed, of diverse lengths, and plentiful.

Amanita muscaria var. guessowii spores are white in deposit, broadly ellipsoid to ellipsoid (infrequently subglobose or elongate) and inamyloid. The spores are (7.0–) 8.7-12.2 (-14.8) x (5.9) 6.5–8.2 (9.5) µm.

The stipe is (4)6 –15 x 1–3 cm, more or less equal or narrowing upwards and slightly flaring at the apex. It is white to yellowish cream, densely stuffed with a pith, the skirtlike ring is membranous, persistent, the lower stipe and upper bulb are decorated with partial or complete concentric rings of volval material that are bright pale yellow to cream or sordid cream.

Diagnostic Description:

The subhymenium of A. muscaria var. guessowii is thicker than the western A. muscaria subsp. flavivolvata.

A. muscaria var. guessowii: Subhymenium wst-near = 70 – 120 µm; wst-far = 95 – 150 µm.

A. muscaria subsp. flavivolvata: Subhymenium wst-near = 60 – 80 µm (good to very good rehydration); wst-near = 80 – 85 (-100) µm (excellent rehydration); wst-far = 85 – 100 µm (good to very good rehydration); wst-far = 95 – 100 (-110) µm (excellent rehydration).


Commonly known as the American Eastern Yellow Fly Agaric.

Description author: Erlon Bailey (Request Authorship Credit)