Technical description (t.b.d.)

BRIEF DESCRIPTION: The cap of A. ushuaiensis is 70  - 110 mm wide, olive-brown to gray-brownhemispheric at first, becoming convex to planar, shiny, often with a silvery sheen, sometimes becoming strongly areolate. The flesh is firm. The volva is present as thick, pale brown patches.

The gills are free to narrowly adnate, moderately distant, pallid cream, with a thickened edge. The short gills are truncate to rounded truncate, of diverse lengths, and common.

The stem is 70 - 120 × 10 - 45 mm, narrowing upward, entirely pale grayish white, more or less club-shaped at maturity, with longitudinal grooves. The ring is weak and disappearing. The bulb is thick and prominent in young material, often slightly tapered, deeply buried in substrate, sometimes splitting, and orangish-brown or dunnish orange or pale dun-colored. The flesh is white and rather firm. The volva is not evident in mature material.

According to Raithelhuber (1980, Metrodiana 9) the spores measure 8 - 11 × 5 - 6.5
(-7) µm and are probably ellipsoid to elongate and inamyloid.

A. ushuaiensis occurs infrequently among mosses near Nothofagus pumilio.

The present species seems so close to the following that the names may be taxonomic synonyms: Amanita merxmuelleri Bresinsky & Garrido and Amanita grauiana Garrido. -- R. E. Tulloss and E. Horak

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Last change 1 June  2006
This page is maintained by R. E. Tulloss.
Copyright 2006 by Rodham E. Tulloss.