Amanita pekeoides

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Amanita pekeoides
Amanita pekeoides imported from iNaturalist photo 268708844 on 12 May 2023.jpg
Amanita pekeoides in Chingford Park, Dunedin, New Zealand
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species:
A. pekeoides
Binomial name
Amanita pekeoides
G.S.Ridl. (1991)

Amanita pekeoides is a species of fungus in the family Amanitaceae. It is endemic to New Zealand. [1]

Contents

Taxonomy

The species was first described scientifically by New Zealand mycologist Geoff Ridley in 1991. [2]

The holotype specimen was collected at Paua Ridge, Orongorongo Valley, Rimutaka Forest Park, Wellington, New Zealand. [2]

The specific epithet pekeoides derives from the Māori word peke meaning sack or bag, in reference to the saccate volva from which the fruiting body emerges. [2]

Description

Ridley described Amanita pekeoides as a “typical member of the Vaginatae” due to the “non-bulbous stipe, saccate volva, and inamyloid basidiospores”. [2]

The pileus of A. pekeoides is described as being between 32–82 millimetres (1+12–3 inches) and convex in shape when immature, gradually becoming plano-convex then plano-depressed as the fruiting body matures. [2] The margin of the pileus is sulcate, with the grooves being greyish sepia while the disc and ridges are hazel to dark greyish sepia, paling at the margin. [2] The pileus is viscid when wet but dries quickly. [2] The lamellae are crowded but free; usually 6–10 mm wide, pale buff to buff with a complete margin that is brown vinaceous to dark grey sepia, and truncated lamellulae. [2] The stipe is typically 7–12 centimetres (3–4+12 in) high, 7–10 mm in diameter, hollow, tapering apically, and the surface is white to pale greyish sepia, with hazel to greyish sepia striate bands, which become finer and more numerous towards the apex. [2] A notable distinction of A. pekeoides from many other Amanita species is its lack of annulus. [2] A. pekeoides exhibits a whitish to pale sepia or pale brown vinaceous, 30–58 mm volva which is often hidden under substrate. [2] The volva starts out fleshy but becomes membranous with age, is saccate and usually bilabiate. [2]

Some Amanita pekeoides found only in the Nelson region of the South Island and Te Urewera National park in the North Island have a distinctly friable volva which leaves remnants on the pileus and stipe. [2] It is yet to be determined whether this characteristic represents a different population entirely or simply indicates a lack of collection from other areas. [2] There are also some individuals which appear to be more whitish in colour but are otherwise identical to other Amanita pekeoides. [2]

Distribution and habitat

A. pekeoides occurs in the North and South Islands of New Zealand, and is primarily associated with Nothofagus species. [1] [2]

See also

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References

  1. 1 2 "VIRTUAL MYCOTA: NZ Fungi Identification: Amanita pekeoides". virtualmycota.landcareresearch.co.nz. Retrieved 2023-05-31.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Ridley, G.S. (1991). "The New Zealand species of Amanita (Fungi: Agaricales)". Australian Systematic Botany. 4 (2): 325–354. doi:10.1071/sb9910325.