The following description is based on original
research by the authors of this page.
The cap of this specis is about 47 mm wide.
At first the center of the cap is buff, while the
remainder is pale grayish. As the mushroom ages
the cap becomes grayer except for the center which
becomes yellower. The cap is ovoid at
first and becomes broadly bell-shaped with a distinct
umbo. The cap's flesh is white. The margin of
the cap is radially grooved with grooves occupying
one-fifth to one-fourth of the cap's radius.
There is no volval material remaning on the cap.
The gills are narrowly connected to the stem in
material viewed so far; they are close and cream
to white. The short gills are squarely
cut-off or nearly so and not very common.
The ringless stem of A. trygonion is 106 - 120 ×
6 - 7.5 mm and white to off-white. The stem is
inserted in a white, persistent, membranous,
sack-like volva ranging up to 29 × 15.5 mm and
attached to the stem's base.
The odor of this mushroom is slight or
indistinct. Its taste has not been recorded.
The spores of A. trygonion measure (7.9-)
9.5 - 12.5 (-13.0) × (7.1-) 8.2 - 10.3 (-11.5) μm and
are dominantly broadly ellipsoid (sometimes subglobse
or ellipsoid) and inamyloid. Clamps are absent
from bases of basidia.
Amanita trygonion is known only from
mixed forest in sandy soils of eastern Texas.
This species suggests
sp-V01 to which the reader may wish to
This species was formerly called "Amanita
sp-T46" on this site.—R. E. Tulloss and R. L.
Tulloss, Pastorino & Kudzma
"Little Dove Ringless Amanita"
, Gr., dovelet, also a "pet name" for a
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.
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 material is based on molecular work of L. V. Kudzma and other original research by R. L. Pastorino and R. E. Tulloss.
Up to 47± mm wide, sordid cream becoming
somewhat grayer with age, with buff disc becoming
somewhat yellower with age, campanulate at first,
then broadly campanulate, with distinct umbo,
glabrous; context white; margin
striate (0.2 - 0.25R); universal veil absent.
adnexed, close, cream-white; lamellulae
truncate or rounded truncate, infrequent to rare.
106 - 120 × 6 - 7.5 mm, white to off-white;
exannulate; universal veil as saccate
volva, roughly cylindric or slightly flaring, white,
membranous, persistent, up to 29 × 15.5 mm, adhering
to stipe base.
Odor slight or indistinct. Taste not recorded.
52 - 59 × 14.8 - 16.5 μm, dominantly 4-, sometimes 1- or 2- sterigmate; ??.
[40/2/1] (7.9-) 9.5 - 12.5 (-13.0) × (7.1-) 8.2 -
10.3 (-11.5) μm, (L = 10.6 - 11.3 μm;
L' = 10.9 μm; W = 9.0 - 9.4 μm;
W' = 9.2 μm; Q = (1.05-) 1.10 - 1.33 (-1.40);
Q = 1.17 - 1.20; Q' = 1.19), hyaline,
colorless, smooth, thin-walled, inamyloid, subglobse
to broadly ellipsoid to (occasionally) ellipsoid,
adaxially flattened; apiculus sublateral,
cylindric; contents dominantly mono-guttulate,
with many additional small granules; white in
In sandy soil of mixed forest dominated by Pinus.
U.S.A.: TEXAS—Hardin Co. - Big Thicket Nat. Preserve, Lance Rosier Unit, 14.vi.2014 Ron Pastorino 6-14-14B [mushroomobserver #167973] (RET 622-5, nrITS & nrLSU seq'd.).
Some years ago, material then thought to be
was collected in eastern Texas [11.vi.2009 D. P.
Lewis 9043 (RET 430-6)]. The nrITS from the
present species is very different from that of RET
430-6 (23.87% difference in pairwise comparison of
tightly trimmed nrITS sequences). We have not
excluded the original material that (from our point
of view) defines sp-V01; sequencing efforts
for the two relevant collections are
underway. The following comparison
sporograph illustrate spores size-shape information
for the present taxon and for material presently
assigned to A. sp-V01.
Next step: Now that we have
genetic data from the present taxon, we need to
get the same from material identified as
sp-V01 for comparison.
This species was formerly called
"Amanita sp-T46" on this site.
—R. E. Tulloss, R. L. Pastorino and L. V. Kudzma
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a single collection inadvertently contains a mixture of taxa.