Biology:Amanita nehuta

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Short description: Species of fungus

Amanita nehuta
Amanita nehuta 39675.jpg
From Auckland, New Zealand
Scientific classification edit
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species:
A. nehuta
Binomial name
Amanita nehuta
G.S.Ridl. (1991)
Amanita nehuta
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium
cap is flat or convex
hymenium is free
stipe has a volva
spore print is white
ecology is mycorrhizal

Amanita nehuta, also called Maori dust amanita, is a species of fungus in the family Amanitaceae.It has only a dark ring rather than a universal veil and white spores. Abundant in New Zealand, it can be found growing under Leptospermum and Nothofagus species.

Taxonomy

The species was first described by New Zealand mycologist Geoff Ridley in 1991.

Description

Gills of Amanita nehuta
Spores of Amanita nehuta
Closer view of the gills (left) and spores (right) of Amanita nehuta

Growing on the ground usually in late summer, the cap is 2.5–6.5 centimetres (1–2 12 inches) wide, plano-convex to plano-depressed, buff, non-viscid, with a striate margin. The volval remnants are pulverulent on the center raised into wart-like peaksor warts or radial ridges, colored pale sepia. Gills are crowded and free, measure 6–7 millimetres (14932 in) wide, and appear white to pale buff. The short gills are subtruncate. Its stipe is 20–75 × 4–11 mm, hollow, exannulate, with a smooth to subfloccose upper stem and smooth lower stem. The surface is white, pale buff, or very pale grayish sepia in color like the cap. The basal bulb is clavate to bulbous, 10–16 mm in diameter. The base has a rim or band of powdery volva, the same color as on the cap. The stem has no ring.[1]

The spores measure 6.5–9 × 5.5–8 (-8.5) µm and are subglobose to broadly ellipsoid to ellipsoid and inamyloid. They are white in color. Clamps are absent at the bases of the basidia. The flesh is white, with a very pale area under the skin in the center.

Similar species

Amanita nehuta is said to be similar to A. farinosa, A. obsita, A. subvaginata and A. xerocybe. All these species appear to have a cap surface that gelatinizes late in development so that the volva remains intimately connected to the cap skin well into maturity of the fruiting body. For this reason, the cap often remains powdery looking well into maturity.[1]

Distribution and habitat

This species was originally described from Wellington, New Zealand, associated with many types of Nothofagus, Leptospermum, and Kunzea. It is also known from the South island of New Zealand.[1]

See also

References

External links

Wikidata ☰ Q4739878 entry