Amanita grossa sensu Aberdeen - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella

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name	Amanita grossa sensu Aberdeen
name status	sensu
intro	This mushroom is known only from a single collection and the associated field notes. The following is based on (Bas 1969).
cap	The cap of Amanita grossa sensu Aberdeen is 140 mm wide, dingy cream, and flattened; the margin may be slightly curled upward in mature specimens. The flesh of the cap is white and unchanging. The cap margin is not grooved. Scattered, small, irregular volval warts may be present.
gills	The crowded, cream gills of this species may be very narrowly attached to the stem at first, but then become free. The short gills narrow gradually with the free edge following a curve.
stem	The whitish stem of this mushroom measures about 80 × 30 mm. It is striate above attachment of a fragile, skirt-like ring that is soon lost. The stem has only a slight expansion at its base. Bas found no material from a volva on the stem.
odor/taste	Odor and taste are unknown for this mushroom.
spores	The spores of A. grossa sensu Aberdeen are 9.0 - 12.0 × 6.5 - 7.5 μm, broadly ellipsoid to ellipsoid to elongate, and amyloid. Clamps are present at bases of basidia.
discussion	Amanita grossa sensu Aberdeen was reported from Mt. Glorious in Queensland, Australia. There is no data on the ecology of that area. The reader may wish to compare this mushroom with A. grossa and other species of Bas' stirps Grossa.—R. E. Tulloss
brief editors	RET

name

Amanita grossa sensu Aberdeen

name status

sensu

GenBank nos.

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accession	locus	voucher	source



No data available in table

revisions

Bas. 1969. Persoonia 5: 508, figs. 282-285.

intro

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 text is based on the revision of Bas (1969).

pileus

from Bas (1969): 140 mm wide, dingy cream, planar; context white, unchanging; margin nonsulcate, slightly revolute; universal veil as scattered warts, small, irregularly shaped.

lamellae

from Bas (1969): adnexed then free, crowded, cream, ca. 10 mm broad, with whitish edge; lamellulae rounded attenuate.

stipe

from Bas (1969): ca. 80 × 30 mm, whitish, striate above partial veil attachment; bulb as slight basal expansion of stipe; context as in pileus; partial veil pendent, submembranous, fragile, evanescent; universal veil absent.

odor/taste

not recorded.

macrochemical
tests

none recorded.

pileipellis

from Bas (1969): gelatinized near surface; filamentous hyphae 3 - 8 μm wide, "with rather many refractive hyphae."

pileus context

not described.

lamella trama

not described.

subhymenium

not described.

basidia

from Bas (1969): 4-sterigmate; clamps present.

universal veil

from Bas (1969): On pileus: often with refractive material in ends of elements; filamentous hyphae 3 - 8 mm wide, branching; inflated cells subcylindric to ellipsoid, up to 100 × 35 μm and 65 × 55 μm, at least sometimes in [terminal] chains; vascular hyphae rather abundant. On stipe: absent.

stipe context

from Bas (1969): longitudinally acrophysalidic; acrophysalides abundant.

partial veil

from Bas (1969): not described [probably absent—ed.].

lamella edge tissue

from Bas (1969): not described [probably absent—ed.]

basidiospores

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Bas (1969): [15/1/1] 9.0 - 12.0 × 6.5 - 7.5 μm, (Q = (1.2-) 1.35 - 1.65; Q = 1.45), colorless, hyaline, thin-walled, amyloid, broadly ellipsoid to ellipsoid to elongate; apiculus not described; contents granular; color in deposit not recorded.

ecology

Bas (1969): no data.

material examined

Bas (1969): AUSTRALIA: QUEENSLAND—Moreton Bay Region - Mt. Glorious, 1961 A. C. Aberdeen 61/133 (L).

discussion

from Bas (1969): "The material available includes a dried sector of a nearly glabrous cap, some fragments preserved in liquid, a rather extensive description, and a rough drawing of a fruit-body. Unfortunately fragments of the volva are scarce.

"The present collection from S. E. Queensland was received from Dr. J. C. Aberdeen under the name A. grossa. It appears indeed to have many characters in common with the type of that species from Tasmania. The main reason that I hesitate to identify the two collections with each other is a difference in the structure of the volval remnants on the cap. In the type of A. grossa the volva apparently consists mainly of ellipsoid to globose, often pedunculate cells intermixed with only a few oleiferous [vascular—ed.] hyphae. The few remnants of of the volva in the present collection consist of a striking number of elongate cells and many oleiferous [vascular] hyphae.

"Amanita grossa has been recorded from Australia by Cleland (1934; 50) and Gilbert (1941: 383). I have not examined their material."

Bas placed the present collection in his stirps Grossa. The following figure provides a sporograph comparison using the limited known data on A. grossa and the present entity:

citations

—R. E. Tulloss

editors

RET

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name	Amanita grossa sensu Aberdeen
name status	sensu

name	Amanita grossa sensu Aberdeen

name	Amanita grossa sensu Aberdeen

Spore data for collections
provisionally identified as: Amanita grossa sensu Aberdeen

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.

basidiospore definition

Spore Measurements by Collection

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