Amanita ushuaiensis - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella

[print] [map]

name	Amanita ushuaiensis
name status	nomen acceptum
author	(Raithelh.) Raithelh.
english name	"Land Of Fire Amanita"
intro	The following is based on the very limited original description of this species.
cap	The cap of A. ushuaiensis is 70 - 110 mm wide, olive-brown to gray-brown hemispheric 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.
gills	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.
stem	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.
spores	According to Raithelhuber (1980, Metrodiana 9) the spores measure 8 - 11 × 5 - 6.5 (-7) µm and are probably predominantly ellipsoid to elongate and are inamyloid. Clamps are probably present at bases of basidia.
discussion	Amanita 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 grauianai Garrido.—R. E. Tulloss and E. Horak
brief editors	RET

name

Amanita ushuaiensis

author

(Raithelh.) Raithelh. 1980. Metrodiana 9: 47.

name status

nomen acceptum

english name

"Land Of Fire Amanita"

synonyms

≡Amanitopsis ushuaiensis Raithelh. 1972. Metrodiana 3(1): xvi??, xxviii.

The editors of this site owe a great debt to Dr. Cornelis Bas whose famous cigar box files of Amanita nomenclatural information gathered over three or more decades were made available to RET for computerization and make up the lion's share of the nomenclatural information presented on this site.

MycoBank nos.

113126, 308607

GenBank nos.

Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages. These pages will eventually be made live, so try again later.

accession	locus	voucher	source



No data available in table

holotypes

in herb. Raithelhuber (not found); "co-type" in herb. E. Horak => ZT

selected illustrations

Raithelh. 1986. Metrodiana 14: 1, color photo. [Misapplication??]
Raithelh. 1987. Hongos I: 368, figs. 492-495.

intro

The following text may make multiple use of each data field.

The field may contain magenta text presenting data from a type study and/or revision of other original material cited in the protolog of the present taxon. Macroscopic descriptions in magenta are a combination of data from the protolog and additional observations made on the exiccata during revision of the cited original material.

The same field may also contain black text, which is data from a revision of the present taxon (including non-type material and/or material not cited in the protolog). Paragraphs of black text will be labeled if further subdivision of this text is appropriate.

Olive text indicates a specimen that has not been thoroughly examined (for example, for microscopic details) and marks other places in the text where data is missing or uncertain.

The following is based on the protolog of the present species and on original research of R. E. Tulloss.

pileus

70–100 mm wide, olive-brown to gray-brown, hemispheric at first, becoming convex to planar, shiny, often with a silvery sheen, sometimes becoming strongly areolate; context firm, white; margin not described; universal veil as thick pale brown patches.

lamellae

free to narrowly adnate, moderately distant, pallid cream, with thickened edge; lamellulae truncate to rounded truncate, of diverse lengths, common.

stipe

70–120 × 10–45 mm, entirely very pale grayish white, narrowing upward, more or less claviform [at maturity], surface smooth to fibrous, grooved-striate; bulb thick [and prominent in young material], often slightly tapered, deeply buried in substrate, sometimes splitting, orange-brownish or dunnish orange or pale dun-colored; context white, rather firm; partial veil tenuous and fugacious; universal veil appressed to bulb or not evident.

odor/taste

Odor and taste insignificant.

macrochemical
tests

none recorded.

ecology

Occurring only among mosses near Nothofagus pumilio, infrequent.

material examined

ARGENTINA: TIERRA DEL FUEGO—Rio Grande-Ushuaia, "summer [1971]" J. Raithelhuber AR-1971 (holotype, in herb. Raithelhuber, current location unknown), 1971 J. Raithelhuber s.n.[?] ("cotype," in herb. Horak => ZT).

discussion

The "cotype" of this species comprises a single, immature specimen. It is clear from this specimen that there is no limbate or saccate volva present. The material has a proportionately large bulbous base compared to the stipe. It seems from his writings that Raithelhuber is one of those who consistently use the word "volva" to mean the basal bulb of species of Amanita that lack a limbate or saccate volva.

The nomenclatural status of the "cotype" is "original material" unmentioned in the protolog. Since Raithelhuber provided spore measurements for this species in the protolog, there must have been at least one other specimen in the holotype. ??Unfortunately, at present, the type has not been located.??

The color on the bulb in the "cotype" is still notable in the exsiccatum and appears to be the color of the exterior of the bulb or the substrate from which it was removed, not the color of appressed volval material.

The stipe of the species is described quite variously by Raithelhuber in different publications. The "co-type" collection is immature with a consequently(?) squat stipe. This could explain the short stipe length given in the protolog; however, despite a longer stipe listed in later descriptions, we have not found such a collection.

The illustration on the cover of Metrodiana 14 (which is also attached to the herbarium file card for the present species in the private herbarium of Raithelhuber) may depict some other taxon—possibly not belonging in Amanita. It looks nothing at all like what one would expect from the protolog of A. ushuaiensis. This photograph shows a pale to white pileus with a portion purplish red. The pileus seems slightly powdery. On the other hand, the stipe is quite thick and appears to have a bulbous base.

No material of this taxon is presently deposited in BAFC (J. E. Wright pers. commun.).

citations

—R. E. Tulloss

editors

RET

Information to support the viewer in reading the content of "technical" tabs can be found here.

name	Amanita ushuaiensis
name status	nomen acceptum
author	(Raithelh.) Raithelh.
english name	"Land Of Fire Amanita"

name	Amanita ushuaiensis
bottom links	[ Keys & Checklists ]

name	Amanita ushuaiensis
bottom links	[ Keys & Checklists ]

Spore data for collections
provisionally identified as: Amanita ushuaiensis (Raithelh.) Raithelh.

Spore data sets and their composite

Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer; and explanations prepared for this site talk about specimen-observer pairs associated with each data set. Combining more data into a single data set is non-optimal because it obscures observer differences (which may be valuable for instructional purposes, for example) and may obscure instances in which a single collection inadvertently contains a mixture of taxa.

Spore Measurements by Collection

[top]