Data will appear on the technical tab of this
This species has a range extending at least from
New York and Connecticut to the Carolinas in the
eastern U.S. Within this range, the species is
common in forests and on lawns with established
trees. It appears to be associated with
at least Oak (Quercus) and Hickory
(Carya).—R. E. Tulloss
Roosevelt Ringless Amanita
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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
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 material is derived from collectors
notes and photographs, from molecular research of
L. V. Kudzma, and other original research of R. E.
43± wide, gray (5Y6-5/1), browner
over disc (especially in young specimens),matte,
finely virgate, hemispheric
at first, becoming planoconvex, finally planar or
concave; context white, not staining or
bruising, 3.5± mm thick over stipe,
thinning evenly for two-thirds of gill
length, then membarnous to margin; margin not
appendiculate, striate (0.35 - 0.4R); universal
veil as patch, white, smooth, thin-papery, not
bruising or staining, detersile.
free to narrowly adnate, with or without short
decurrent line on stipe
apex, close, white to pale cream in mass and side view,
1.5 - 4 mm broad, sometimes forking or anastomosing;
80 - 84 × 5 - 11 mm, white, narrowing upward,
sometimes flaring at apex,
finely pulverulent or finely squamulose above,
longitudinally striatulate below,becoming tannish
where handled or not staining or bruising, sometimes
becoming silky/shiny where handled;
context white to pale cream, not bruising,
stuffed, with stuffing white and cottony comprising
longitudinally oriented and densely packed fibrils,
with central cylinder 1.5 - 4.5 mm wide;
exannulate; universal veil as saccate
volva, membranous, ca. 11± mm wide,
attached only at stipe base and sometimes easily
removed, with exterior white, with interior
gray, soft-leathery, 22-30 mm from
base to highest point of limb, with limb < 1 mm
thick, with limbus internal very thin and white and
Odor lacking. Taste not reported.
Spot test for tyrosinase (1% paracresol) entirely
positive throughout basidiome in less than 2
Spot test for laccase (0.1% syringaldazine) negative
throughout entire basidiome after 16 mins.
Voucher: Tulloss 8-9-87-H.
Composite of specimens determined with use of nrDNA:
[20/1/1] 7.7 - 10.5 (-12.6) × (6.6-) 7.0 - 8.7
(-9.4) μm, (L = 9.9 μm; L' = 9.9
μm; W = 7.8 μm; W' = 7.8 μm;
Q = (1.05-) 1.13 - 1.36 (-1.40); Q = 1.27;
Q' = 1.27), hyaline, colorless, smooth,
thin-walled, inamyloid, subglobose to broadly
ellipsoid to ellipsoid;
?? in deposit.
Composite of measurements from collections
originally assigned to "sp. 17" on morphological
grounds: [315/16/14] (6.6-) 8.4 - 12.2 (-16.8)
× (5.2-) 6.6 - 8.4 (-11.9) μm,
(L = 9.2 - 10.8 (-10.9) μm; L' =
10.1 μm; W = 7.1 - 7.8 (-8.0) μm;
W' = 7.5 μm; Q = (1.05-) 1.17 - 1.55
(-1.80); Q = (1.21-) 1.27 - 1.44; Q'
= 1.35), hyaline, colorless, smooth, thin-walled,
broadly ellipsoid to ellipsoid, infrequently
subglobose or elongate, adaxially flattened;
apiculus sublateral, ??; contents
monoguttulate, with or without additional small
granules; white in deposit.
Solitary to subgregarious.
Iowa: In dark prairie soil under Quercus
macrocarpa in lawn.
At 15 - 325 m
elev. In lawn under
Carya illinoinensis with Pinus strobus
at a greater distance or under Quercus
(including Q. palustris) or in sandy soil of
Quercus-Pinus rigida barrens.
New York: At ca. 88 m elev.
North Carolina: At ca. 253 m elev.
Pennsylvania: At 340-435 m elev.
in area predominated by Quercus or in
sunny lawn with Carya ovata or in
by Quercus with some Tsuga
CONNECTICUT—Middlesex Co. -
Portland Twp., Hurd St. Pk.
[41.5215° N/ 72.5413° W,
109 m], 23.viii.2007 David Work
s.n. [Tulloss 8-23-07-A] (RET 440-7,
FLORIDA—Leon Co. - Tallahassee
[30.4264º N/ 84.2847º W, 62 m], 19.vi.2017 Russell
de Grove s.n. [mushroomobserver
(RET 783-4, nrLSU seq'd.).
GEORGIA—Fulton Co. - Atlanta
[33.5151° N/ 95.6773° W, 135 m], 20.v.2018 Andrew
Bocz s.n. [mushroomobserver
(RET 820-8, nrLSU seq'd.).
IOWA—Jasper Co. - SE of Acres, rest stop
on I-80 ca. mile 180, 1.ix.2008 R. E. Tulloss
9-1-08-A (RET 423-7, nrLSU seq'd.).
MARYLAND—Harford Co - Bel Air, Bynum
Run Conservation Area [39.4948° N/ 76.2856° W, 26 m]
6.viii.2018 Ryan Pridgeon
(RET 858-10, nrITS-LSU seq'd.).
MISSISSIPPI— Newton Co. - Union,
v. or vi.2018 Jimmy Cannette s.n.
(RET 819-2, nrLSU seq'd.), s.n. (RET 819-3, nrITS-LSU
seq'd.), s.n. (RET 819-7, nrSLU sed'd.).
NEW JERSEY—Essex Co. - Maplewood,
Renato DeBellonia s.n. (RET 368-4, nrITS & nrLSU
Hunterdon Co. - Lebanon,
Oakmoss Mycological Preserve [40.8353° N/
74.7975° W, 321 m], 19.vii.2007 Richard B.
Balsley s.n. (RET 408-9, nrLSU seq'd.),
28.vii.2007 R. B.
Balsley s.n. (RET 413-9, nrLSU seq'd.).
Mercer Co. - Princeton [40.3656° N/ 74.6633 W, 55 m],
7.vi.1989 R. E., M. H. &
D. C. Tulloss [Tulloss 6-17-89-A] (RET 243-10, nrITS
& nrLSU seq'd.);
Washington Crossing St. Pk., arboretum
area [40.2991° N/ 74.8667° W, 32 m],
5.vii.1984 R. E. Tulloss 7-5-84-H (RET 056-7,
Monmouth Co. - Borough of
Roosevelt, 10 Farm Lane [40.2178° N/ 74.4728° W,
43 m], 26.viii.2011 Mary K. & R. E. Tulloss
(RET 487-1, nrLSU & rpb2 seq'd.);
Borough of Roosevelt, 21 Lake Drive
[40.2192° N/ 74.4737° W, 47 m], 11.vi.1989 R. E.
Tulloss & M. A. King 6-11-89-A (RET 244-4, nrITS &
nrLSU seq'd.), 18.vi.1989 R. E.
Tulloss 6-18-89-A (RET 243-9, nrITS & nrLSU
seq'd.), 5.viii.2004 R. E.
Tulloss 8-5-04-C (RET 379-10, nrLSU seq'd.);
Borough of Roosevelt, Roosevelt Public School
grounds [40.2178° N/ 74.4750° W, 43 m], 6.vii.1994
R. E. & S. E. K. Tulloss & Alison Carpenter [Tulloss
7-6-95-A] (RET 128-9),
18.ix.2006 M. K. & R. E. Tulloss 9-18-06-A
Shark River Co. Pk. [40.2050° N/ 74.0956° W, 16 m],
9.viii.1987 NJMA foray participant s.n. [Tulloss
8-9-87-H] (RET 180-8, nrLSU & rpb2
Warren Co. - Columbia, Beulahland Farview, off Old
Mine Rd., 4.viii.2012 Fran Sheldon s.n.
[Tulloss 8-4-12-S] (RET 507-9, nrLSU seq'd.);
Jenny Jump St. For., Springs Tr. &
Summit Tr. 4.viii.2012 J. Wheeler s.n. [Tulloss
8-4-12-P] (RET 505-10, nrLSU seq'd.); Stephens St. Pk.,
ca. lower picnic area, 4.viii.1996 Rhoda Roper s.n.
[Tulloss 8-4-96-I] (RET 229-6).
NEW YORK—Cattaraugus Co. - Olean, 23.vi.2015
Garrett Taylor s.n. [mushroomobserver
(RET 695-7, nrLSU seq'd.).
Greene Co. W of Rte. 67
[42.382° N/ 74.089° W, 183 m], 13.ix.2018 Mical Moser
& Tim Fosters s.n. (RET 843-1, nrLSU seq'd.
Ulster Co. - Rochester
Twp., Epworth Camp & Retreat Ctr.
[41.8083° N/ 74.16° W, 88 m], 18.viii.1994
Susan Hopkins s.n. [Tulloss 8-18-94-A] (RET 129-9,
NORTH CAROLINA—Iredell Co. -
Statesville, jct. of U.S. Hwy. 70 & Westminster
Dr. [35.7763° N/ 80.9426° W, 253 m],
7.ix.1995 Allein C. Stanley s.n. (RET 158-3,
PENNSYLVANIA—Luzerne Co. - Hunlock Crk.
[41.9321° N/ 76.0824° W, 430 m], vi./vii.2008 David
Wasilewski s.n. (RET 421-4, nrITS-LSU seq'd.),
19.vi.2012 D. Wasilewski s.n. [mushroomobserver
9.vii.2012 D. Wasilewski s.n. [mushroomobserver
(RET 526-7, nrITS-LSU seq'd.), 13.vii.2014 D.
Wasilewski s.n. [mushroomobserver
(RET 644-2, nrITS-LSU seq'd.),
22.vii.2014 D. Wasilewski s.n. [mushroomobserver
(RET 642-4, nrLSU & rpb2 seq'd.), 29.vii.2014 D.
Wasilewski s.n. [mushroomobserver
(RET 655-7, nrLSU seq'd.), 5.ix.2014 D. Wasilewski
(RET 655-3, nrLSU & rpb2 seq'd.), 8.vii.2015
D. Wasilewski s.n. [mushroomobserver
(RET 706-6, nrLSU seq'd.); Mountain Top
[41.1221° N/ 75.953° W, 342 m] 1.viii.2013 P. Yeager
& Jack Tardecki s.n. [mushroomobserver
(RET 558-4, nrLSU seq'd.), 11.vii.2019 D. Wasilewski
(RET 655-5, nrITS-LSU seq'd).
Schuylkill Co., Tuscarora St. Pk. [40.7971º N/
76.0147º W, 435 m], 23.vii.2016
D. Wasilewski s.n. [mushroomobserver
(RET 768-3, nrLSU seq'd.).
LIMITS TO GENETIC IDENTIFICATION
As of 30.x.2019, Amanita rooseveltensis has
not yielded data
that allowed derivation of a complete sequence from
its nrITS locus using unamended Sanger
one case, we obtained a few characters of the 3' end
of 5.8S and a complete ITS2. The situation
bears the hallmarks of a nrITS that has failed to
The nrLSU sequence for rooseveltensis is
variable. Pairwise matching between the 16
sequences known on 11 July 2017 ranged from 99.368
percent of nucleotide positions identical to
99.912%. The variation mostly
can be be found in one
character position—a single nucleotide
This species has previously also been listed in this
site under the temporary code "A. sp-IA01."
—R. E. Tulloss, L. V. Kudzma & D. Wasilewski
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Tulloss, Kudzma & Wasilewski
Roosevelt Ringless Amanita
1. Amanita rooseveltensis, Hunlock Creek, Luzerne Co., U.S.A. (RET 642-4)
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.