Amanita jacksonii
| Amanita jacksonii | |
|---|---|
| Maine specimen in July | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Amanitaceae |
| Genus: | Amanita |
| Species: | A. jacksonii
|
| Binomial name | |
| Amanita jacksonii | |
| Synonyms[1] | |
|
Amanita umbonata Pomerl. | |
| Amanita jacksonii | |
|---|---|
| Mycological characteristics | |
| Gills on hymenium | |
| Cap is convex | |
| Hymenium is free | |
| Stipe has a ring and volva | |
| Spore print is white | |
| Ecology is mycorrhizal | |
| Edibility is choice but not recommended | |
Amanita jacksonii, also known as Jackson's slender amanita,[2] American slender Caesar, and eastern Caesar's amanita,[3] is a North American species of fungus in the family Amanitaceae. It is a reddish-orange colored mushroom species which can be identified by its yellow gills, large, white, sacklike volva.[4]
History
It was given its current name in 1984 by Canadian mycologist René Pomerleau. The species was named in honor of Canadian watercolorist and mycological illustrator Henry A. C. Jackson. Both Pomerleau and Jackson were primarily active in Quebec, and first described the species from specimens found in that province.[5][6]
Description
The cap of the mushroom is 8–12 centimetres (3–4+1⁄2 inches) 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] The 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.
The stipe measures 90–140 by 9–16 millimetres (3+1⁄2 in–5+1⁄2 in × 1⁄4 in–3⁄4 in), is yellow and 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.
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A newly emerged specimen
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Specimens in North Carolina
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Striated cap margin
Similar species
A. jacksonii looks similar to A. caesarea (Caesar's mushroom), which is found in Europe and North Africa, as well as poisonous species of Amanita.
Distribution and habitat
Its range extends from the Province of Quebec, Canada, to at least the State of Hidalgo, Mexico.[9] It has been observed as far south as Cayo District, Belize.
Uses
The mushroom is considered a choice edible, although it can be confused with toxic species such as A. muscaria and A. phalloides.[10]
See also
References
- ^ "Amanita jacksonii - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella". www.amanitaceae.org. Retrieved 21 September 2017.
- ^ "Standardized Common Names for Wild Species in Canada". National General Status Working Group. 2020.
- ^ "Amanita jacksonii". plants.ces.ncsu.edu. Archived from the original on 2025-11-18. Retrieved 2026-01-18.
- ^ "Amanita jacksonii (MushroomExpert.Com)". www.mushroomexpert.com. Archived from the original on 2025-11-05. Retrieved 2026-01-18.
- ^ Pomerleau, René (1984). "A propos du nom scientifique de l'oronge américaine" (PDF). Naturaliste Canadien (in Canadian French). 111 (3): 329–30. Archived (PDF) from the original on 2025-03-27.
- ^ "L'homme avec un panier : Henry A.C. Jackson, naturaliste, mycologue et aquarelliste" [The man with a basket: Henry A.C. Jackson, naturalist, mycologist, and watercolorist]. Cercle des Mycologues de Lanaudière et de la Mauricie (in Canadian French). 2023-06-09. Archived from the original on 2024-07-22. Retrieved 2025-12-21.
- ^ http://www.eticomm.net/~ret/amanita/species/jacksoni.html Archived 2011-07-16 at the Wayback Machine By R. E. Tulloss.
- ^ "Amanita jacksonii". www.amanitaceae.org. Archived from the original on 2012-03-15. Retrieved 2026-01-18.
- ^ "Mushroom Observer". mushroomobserver.org. Archived from the original on 2020-11-24. Retrieved 2026-01-18.
- ^ 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.