| name |
Amanita ostendemihi |
| author |
Tulloss, S. D. Russell, K. W. Hughes, D. P. Lewis,
& P. G. Harv. |
| name status |
nomen provisorum |
| english name |
"Show Me Blusher" |
| etymology |
ostende mihi, show me; in honor of Missouri (the
"Show me" state), the Missouri Mycological Society
(MOMS), and the collector who sent us the first
specimen of this species studied by RET—
Patrick Harvey. |
| 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.
|
| 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 material is based on original
research of R. E. Tulloss. Genetic sequences and
analyses are courtesy of Dr. Karen W. Hughes, Univ. of
Tennessee, Knoxville, and Stephen D. Russell, Purdue
University. |
| pileus |
50 - 90 mm wide, white and somewhat translucent,
irregularly hemispheric to subcampanulate with
incurved margin at first, then hemispheric to
plano-convex, occasionally depressed, occasionally
slightly umbonate, unchanging when cut or bruised,
tacky, shiny, with suggestion of embedded concolorous
radial fibrils; context white, with watery line
adjacent to lamellae, unchanging when cut or bruised,
5 - 6.5 mm thick over stipe, thinning evenly to
margin, sometimes becoming deeply rimose;
margin nonstriate, sometimes becoming faintly
striate (up to 0.1R), longer in age,
nonappendiculate; universal veil absent or as
irregular warts or submembranous patch of loosely
connected warts, white to off-white, graying with
age, verrucose to subfelted, friable, detersile. |
| lamellae |
free to narrowly adnate with decurrent tooth and
(often) decurrent line on stipe apex,
??, white in mass
(sometimes faintly pink at first), white in side view,
unchanging when cut or bruised, rather thick, 3 - 7 mm
broad, with margin minutely fimbriate (white),
occasionally to rather commonly anastomosing,
sometimes exhibiting inverse forking lamellulae
truncate to rounded truncate subtruncate to
subattenuate to attenuate, sometimes adjacent to stipe
rather than pileus margin, unevenly distributed, of
diverse lengths, plentiful. |
| stipe |
57 - 135 × 5 - 12 mm, white, unchanging when cut or
bruised, narrowing upward or downward, slowly flaring
over distance of 6 - 10± mm at apex, with
plentiful appressed white fibrils (lens) or minutely
fibrillose (lens) or matted-floccose; bulb 22 - 42 ×
14.5 - 21 mm, subnapiform to subradicating, with
attached white mycelium; context solid to firmly
stuffed, white, unchanging when cut or bruised or
rarely pale pinkish brown in lower stipe, pale yellow
to pale yellow-tan to slightly grayish to wine-brown
in larva tunnels; partial veil apical to subapical,
ample, skirtlike, striate above, floccose-flocculose
to fibrillose below, with line of beige (eventually
graying) universal veil material on edge or on
underside near edge, eventually collapsing on stipe;
universal veil not evident or as detersile patch(es)
easily left in soil or in broken collars or
irregular rows [sometimes faint and sometimes
suggesting the “collars” seen in
A. muscaria
(L. : Fr.) Lam.], off-white to very pale
grayish, darkening in age. |
| odor/taste |
Odor mild or pleasant when cut,
close to floral, sometimes strongly floral.
Taste not recorded. |
macrochemical
tests |
none recorded. |
| subhymenium |
pseudoparenchymatous (cellular). |
| basidia |
?? × ?? μm, 4-sterigmate, with sterigmata up to 4.8 × 2.0 μm; clamps not observed. |
| lamella edge tissue |
sterile. |
| basidiospores |
RET: [214/10/8] (5.9-) 6.8 - 9.0 (-10.4) × (4.1-)
4.9 - 6.2 (-7.2) μm, (L = 7.3 - 8.2 μm;
L' = 7.9 μm;
W = 5.2 - 5.5 (-6.0) μm; W' = 5.4 μm;
Q = (1.12-) 1.25 - 1.64 (-1.82);
Q = 1.35 - 1.51; Q' = 1.46), hyaline, colorless, smooth,
thin-walled, amyloid, predominantly ellipsoid,
infrequently broadly ellipsoid or elongate, usually at
least somewhat adaxially flattened; apiculus
sublateral, cylindric; contents dominantly
monoguttulate (oil drop type) with or without
additional granules, infrequently granular; color in
deposit not recorded. |
| ecology |
Solitary or in small groups. Georgia: Under
Quercus acutissima.
Oklahoma: Scattered. In mixed forest with
Quercus stellata and
Q. marilandica. South Carolina: In red
clay of road bank under Pinus echinata,
Q. marilandica, Q. nuttallii,
Cornus florida, Q. stellata, and
Juniperus virginiana or at roadside under
Carya sp., Liriodendron tulipifera,
C. florida, Q. marilandica (as scrub),
and (at a distance) Q. alba.
Texas: In mixed forest or in
loamy clay or in mixed
Pinus and hardwood forest or with Quercus
nigra. |
| material examined |
U.S.A.:
ALABAMA—Unkn. Co. -
ca. border of Shelby & Jefferson Cos., unkn.
loc., 22.viii.1984 C. Bas, D. T. Jenkins, R. E.
Tulloss 8-22-84-D (RET 236-7).
GEORGIA—Harris Co., unkn. loc.,
1.vi.2018 W. Jake Langer Parkes s.n. [mushroomobserver
#318269]
(RET 820-6, nrITS & nrLSU seq'd.).
LOUISIANA—East Baton Rouge Parish - Baton
Rouge [30.4414° N/ 91.1086° W, 14 m],
26.vi.2018 Logan Wiedenfeld s.n. [mushroomobserver
#320956
(RET 823-9,
nrITS & nrLSU seq'd.). Vernon Parish -
Vernon Distr., Kisatchie Nat. For. [30.978º N /
93.166º W, 77 m], 25.v.2013 David P. Lewis
10703 (RET 605-5, nrITS & nrLSU seq'd.),
10710 (RET 606-2, nrITS & nrLSU seq'd.).
MISSOURI—St. Charles Co. - Weldon Springs
[38.6800° N/ 90.7165° W, 150 m], 8.vii.2013 Patrick
Harvey s.n. [mushroomobserver
#139080]
(RET 552-6, nrITS & nrLSU seq'd.).
NEW YORK—Oneida Co. - unkn. loc.,
3.x.2013 Eric Smith s.n. [mushroomobserver
147255]
(RET 598-1, nrITS & nrLSU seq'd.).
OKLAHOMA—Logan Co. - unkn. loc., jct.
Bryant Ave. & Waterloo Rd., 2.vii.2004 Clark
Overbo 4440 (CSU, nrITS & nrLSU seq'd.).
PENNSYLVANIA—Lackawanna Co. -
Lackawanna St. For., Thomhurst [41.2006° N/
75.6025° W, 523m], 4.vii.2013 David
Wasilewski s.n. [mushroomobserver
138823]
(RET 550-7, nrITS & nrLSU seq'd.).
SOUTH CAROLINA—Oconee Co. - Seneca
[34.7692° N/ 82.9653° W, 263 m],
27.vi.1985 Mary King & R. E. Tulloss 6-27-85-E
(RET 054-1, nrITS & nrLSU seq'd.), 28.vi.1985
Mary King & D. C. &
R. E. Tulloss 6-28-85-A (RET 056-2),
Mary King [Tulloss 6-28-85-D] (RET 054-2, nrITS &
nrLSU seq'd.).
TEXAS—Hardin Co. - Big Thicket National
Preserve, Lance Rosier Unit, 15.vi.1986 David P.
Lewis 3973 (RET 617-3, LSU seq'd.); Silsbee, Roy Larson
Sandyland Sanctuary, 10.vi.2000 Rhoda Roper s.n.
[Tulloss 6-10-00-N] (RET 312-2, nrITS & nrLSU
seq'd.).
Marion Co. - ca. Gray Community, Caddo Lake Wildlife
Mgmt. Area [32.7162º N/ 94.0850º W, 99 m],
17.vi.2017 David P. Lewis 12470
(RET 808-10, nrITS & nrLSU seq'd.).
Newton Co. - Tim Pevoto's residence off Co. Rd. 3062
[30.711º N /93.833º W, 35 m], 31.v.2013 D. P. Lewis
10716 (RET 605-9, nrLSU seq'd.).
Tyler Co. - Lake Hyatt area, Watson Rare Plant
Preserve [30.581º N/ 94.379º W, 35 m], 1.vi.2013
D. P. Lewis 10722 (RET 605-3, nrITS &
nrLSU seq'd.). Unkn.
Co. - unkn. loc. [east Texas], 26.x.1985 Texas
Mycol. Soc. foray participant s.n. [Tulloss
10-26-85-F] (RET 082-7). |
| discussion |
The present species was often mistaken for Amanita
maryaliceae prior to their segregation by
molecular means.
The following figure provides a sporograph comparison
to A. maryaliceae:
The following figure provides a sporograph comparison
to A. rubescens var. alba:
The spore sample size for the present species is small
and, moreover, much of the hymenial surface of the
original Missouri specimen is markedly immature;
hence,
we might expect proportionately larger and more
slender spores in a mature specimen.
The yellow on the partial veil in the background
image looks like a photographic artifact.
there is no yellow in the other image showing the
partial veil.
The species is genetically distinct from Amanita
rubescens var. alba.
The range provided in the "material examined" data
field, above, has been extended to Indiana with
molecular support by Stephen Russell on
inaturalist.org
[here].
This species was formerly known in these pages as
"Amanita sp-MO02." |
| citations |
—R. E. Tulloss |
| editors |
RET |
|
Spore data sets and their composite