Amanita nehuta

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Amanita nehuta
Amanita nehuta 39675.jpg
From Auckland, New Zealand
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species: Amanita nehuta
Binomial name
Amanita nehuta
G.S. Ridl.
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
edibility: poisonous

Amanita nehuta, also called Maori Dust Amanita, is a species of fungus in the Amanitaceae family. It was first described by New Zealand mycologist Geoff Ridley in 1991. It occurs in New Zealand in large number. It has only a dark ring rather than a universal veil and white spores. It is found under leptospermum and Nothofagus. It grows on ground usually in late summer. Its height is 110 mm and width is 100 mm.[1]

Description[edit]

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

The physical description is as follows:[2]

  • Cap : The cap is 25 – 65 mm 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 sepiAmanita
  • Gills : Gills are crowded and free, measure 6 - 7 millimeters wide, and appear white to pale buff. The short gills are subtruncate.
  • Stem/Stipe : Its stem, or stipe, is 20 - 75 × 4 - 11 millimeters, hollow, exannulate, with a smooth to subfloccose upper stem and smooth lower stem. The surface is white, very 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.
  • Spores and microscopic features : 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.
  • Flesh : The flesh is white, with a very pale area under the skin in the center.

Distribution and habitat[edit]

This species was originally described from Wellington, New Zealand, associated with many types of Nothofagus, Leptospermum, and Kunzea. It is also known from both North and South islands of New Zealand.[2]

Similar species[edit]

Amanita nehuta is said to be similar to Amanita farinosa, Amanita obsita, Amanita subvaginata and Amanita 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.[2]

See also[edit]

References[edit]

  1. ^ Family: Pluteaceae (Amanita) and species http://www.hiddenforest.co.nz/fungi/family/pluteaceae/amanitAmanitahtm
  2. ^ a b c Tulloss R. E. "Amanita nehuta". 

External links[edit]