Amanita jacksonii

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Amanita jacksonii
Amanita jacksonii Maine USA.jpg
A. Jacksonii in Maine, USA, July 2021.
Scientific classification edit
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
A. jacksonii
Binomial name
Amanita jacksonii

Amanita umbonata Pomerl.
Amanita tullossii Guzmán & Ramírez-Guillén

Amanita jacksonii
View the Mycomorphbox template that generates the following list
Gills on hymenium
Cap is flat or convex
Hymenium is free
Stipe has a ring and volva
Spore print is white
Ecology is mycorrhizal
Edibility: edible but not recommended
A newly emerged, growing A. Jacksonii.
A. Jacksonii at Salem Lake in NC

Amanita jacksonii, also known as Jackson's slender amanita,[2] American Slender Caesar, and Eastern Caesar's Amanita,[3] is a species of fungus in the family Amanitaceae. It is a reddish-orange colored mushroom species extending from the Province of Quebec, Canada to at least the State of Hidalgo, Mexico. It was given its current name in 1984 by Canadian mycologist René Pomerleau.[4][5] It can be identified by its yellow gills, large, white, sacklike volva, and bright orange or orange-red cap, which has lined margins.[6]


The cap of the mushroom is 8–12 cm wide; oval at first, becoming convex, typically with a central bump; sticky; brilliant red or orange, fading to yellow on the margin; typically without warts or patches; the margin lined for about 40–50% of the cap's radius. The red pigment fades from margin toward the center with age.[7] Gills are moderately crowded to crowded, orange-yellow to yellow-orange to yellow. They are free from the stem or slightly attached to it; yellow to orange-yellow; crowded; not bruising. The short gills are subtruncate to truncate. Its stipe or stem (90–140 × 9–16 mm) is yellow and is decorated with orange fibrils and patches that are the remnants of a felted extension of the limbus internus of the otherwise white volva. The spores measure (7.0-) 7.8 - 9.8 (-12.1) × (5.2-) 5.8 - 7.5 (-8.7) μm and are broadly ellipsoid to ellipsoid (rarely subglobose or elongate) and inamyloid. Clamps are common at bases of basidia.[8] The flesh looks whitish to pale yellow, and does not stain on exposure.

The mushroom is considered edible, although it can be misidentified with toxic species such as Amanita muscaria and A. phalloides.[9] A. jacksonii looks similar to Amanita caesarea, Caesar's mushroom that is found in Europe and North Africa.

See also[edit]


  1. ^ "Amanita jacksonii - - Taxonomy and Morphology of Amanita and Limacella". Retrieved 21 September 2017.
  2. ^ "Standardized Common Names for Wild Species in Canada". National General Status Working Group. 2020.
  3. ^ accessed Aug. 2021
  4. ^ Mushroom Observer-Amanita jacksonii Pomerleau
  5. ^ Pomerleau R. (1984). "A propos du nom scientifique de l'oronge américaine". Naturaliste Canadien (in French). 111 (3): 329–30.
  6. ^ Kuo, M. (2008, March). Amanita jacksonii. Retrieved from the MushroomExpert.Com Web site:
  7. ^ Archived 2011-07-16 at the Wayback Machine By R. E. Tulloss.
  8. ^ Amanita
  9. ^ Davis, R. Michael; Sommer, Robert; Menge, John A. (2012). Field Guide to Mushrooms of Western North America. Berkeley: University of California Press. pp. 70–71. ISBN 978-0-520-95360-4. OCLC 797915861.

External links[edit]