| name |
Amanita pubescens sensu Coker |
| author |
sensu Coker.
1917. J.
Elisha Mitchell Scient. Soc. 33(1/2): 14, pl. 8-9,
63. |
| name status |
sensu |
| english name |
"Coker's Pubescent Amanita" |
| GenBank nos. |
Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages.
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|
| revisions |
Tulloss herein. |
| 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.
Apparently there is no type for A. pubescens
Schwein. per Jenkins
(1977.
Biblioth. Mycol. 57: 79). Jenkins
considered Schweinitz' name a nomen
dubium.
Coker (1917)
comments, "That this is Schweinitz's species I have
no doubt."
The protolog of Amanita pubescens Schwein. is
to be found here:
1822.
Schriften Naturf. Ges. Leipzig 1: 79.
The protolog is presented here in its entirety:
"554. 17. pileo pubescente luteo margine
involuto, lamellis candidis, stipite brevi bulboso
e candido lutescente pubescente.
"Raris in graminosis Julio. Pileus tenui pube
obtectus. Stipes brevis, vix unciam separans,
bulbo crasso, volva evanescente, annulo
nullo."
Translation (with added punctuation for
readability):
554. 17. with yellowish pubescent pileus with
decurved margin; with lamellae white; with stipe
short, bulbous, from white becoming yellowish,
pubescent
Rare, in grass, July. Pileus thin, covered
with pubescence. Stipe short, separating with
some difficulty, with broad bulb, with evanescent
volva, exannulate.
The following material is based on the description
of this taxon by Coker
(1917);
recently annotated and photographed collections from
Texas and Oklahoma with annotations and photographs
by David P. Lewis and Dr. Clark Ovrebo,
respectively; and revision of available material by
R. E. Tulloss. |
| pileus |
23 - 85 mm wide, very light brown (near Ridgway's
Maize Yellow but paler) to sordid whitish to light
brownish, hemispheric at first then convex to
planoconvex to planar,
slightly depressed in disc with age,
moist; context 4 - 10 mm thick, slightly
yellowish white to sordid whitish
to light brownish; margin slightly striate
(up to 0.25R),
decurved; universal veil as small, often
rather flat, soft warts, concolorous with pileus,
sometimes scattered, "densest over disc, firmly
adherent" (Coker
1917). |
| lamellae |
free (but just barely per Coker), close to "rather
crowded" (Coker
1917), whitish
or concolorous with pileus, 4 - 13 mm broad, acute at
stipe end, rounded at pileus margin and with
considerable portion exposed below pileus margin, with
fimbriate to flocculent edges; lamellulae
truncate, of diverse lengths,
?frequency hard to
determine in dried material?. |
| stipe |
10 - 75 × 4 - 15 mm (length probably includes part
or all of bulb), very pale ash gray (nearly white) to
white to light brownish, moist, sometimes browning,
pulverulent to
glabrous, constricted about mid-height or narrowing
downward, flaring at apex; bulb rather abrupt,
somewhat
radish-shaped [with radical curling upward (somewhat
suggesting pig's tail) in one Texas specimen] or
turbinate, "usually more than half" within
substrate; context solid, firm, with
"central cylinder of white, rather
firm stuffing"; exannulate;
universal veil creamy yellos to buff,
as firm "conspicuous but low,
irregular rim" on bulb ("almost cothurnate" in
Overebo 4754), sometimes with ridge extended
by triangular detersile fragments of membranous
limb, with exterior covered with "fibrous
flocculence" or (Ovrebo 4754) "matted tomentose." |
| odor/taste |
Odor mild. Taste not recorded. |
macrochemical
tests |
none recorded. |
| pileipellis |
25 - 45 μm thick, apparently lacking gelatinized suprapellis, i.e., comprising single uniform layer; filamentous undifferentiated hyphae 2.5 - 4.2 μm wide, interwoven densely in lateral view, subradially oriented in scalp view, sometimes appearing glued together by gelatinized material from universal veil. |
| lamella trama |
bilateral, divergent; filamentous undifferentiated hyphae ??; inflated cells ??; vascular hyphae 12.6 - 15.0 μm wide, sinuous, sometimes coiling. |
| subhymenium |
comprising 2 - 4 layers of subglobose inflated cells and some inflated branching cells, small cylindric to subglobose cells may be at bases of shorter basidia. |
| basidia |
53± × 14.5 μm, ??; clamps present (frequency not determined). |
| universal veil |
On the pileus: filamentous undifferentiated hyphae 1.8 - 6.3 μm wide, branching, plentiful, with some terminal segments slightly gelatinized; inflated cells common, thin-walled, subfusiform to narrowly clavate to broadly sausage-shaped (e.g., 44 × 22 μm) or narrowly ellipsoid (e.g., 65 × 24 mu;m) or broadly clavate to ellipsoid (22 - 51 × 16.8 - 32 μm) or subglobose (e.g., 28 × 25 μm), terminal singly; vascular hyphae 2.5 - 4.6 μm wide, common, sinuous; clamps rather frequent. On stipe base: ??. |
| stipe context |
longitudinally acrophysalidic; at surface becoming partially gelatinized, otherwise, like interior, densely packed tissue dominated by acrophysalides; filamentous undifferentiated hyphae 3.5 - 9.4 μm wide, branching difficult to observe due to tissue density; acrophysalides up to 135 × 33 μm, with walls ?? μm thick; vascular hyphae 2.5 - 9.8 μm wide, common, branching, subsinuous to sinuous; clamps present. |
| lamella edge tissue |
sterile. |
| basidiospores |
[60/3/2] (8.4-) 9.3 - 11.0 (- 12.0) × (6.4-) 6.5 - 8.0 (-9.3) ) µm, (L = 9.6 - 10.7 µm; L' = 10.1 µm; W = 7.1 - 7.6 µm; W' = 7.4 µm; Q = (1.22-) 1.28 - 1.50 (-1.57); Q = 1.35 - 1.41; Q' = 1.38). |
| ecology |
Scattered to gregarious.
Louisiana: At 7-21 m elev. Often in open areas,
with Quercus spp., for example Q.
falcata, Q. stellata, or Q.
virginiana.
North Carolina: "[I]n dry sandy soil in open
groves."
Oklahoma: At ca. 330 m elev. Under Quercus spp.
including Quercus marilandica.
Texas: Under Quercus alba. |
| material examined |
RET: U.S.A.:
LOUISIANA—East Baton Rouge Parish -
Baton Rouge, Louisiana State Univ. [30.4086º N/
91.1832º W, 7 m], 10.vii.2017 Logan Wiedenfeld s.n.
[mushroomobserver
#278311]
(RET 802-10, nrITS & nrLSU seq'd.).
Evangeline Parish - Chicot St. Pk., ca. W entrance
[30.791º N /92.282º W, 20-21 m], 8.ix.2012 David P.
Lewis 10458 (RET 605-4, nrITS seq'd.),
D. P. Lewis 10459 (RET 606-8, nrITS seq'd.).
NORTH CAROLINA—Orange Co. - Chapel Hill,
Univ. of North Carolina, on path between athletic
field and Meeting of the Waters [ca. 35°54'04" N/
79°02'02" W, 101 m], 12.ix.1913 W. C. Coker 739 (NCU);
Chapel Hill, Univ. of North Carolina, ca. NE gate of
arboretum, 14.ix.1913 W. C. Coker 767 (NCU); Chapel
Hill, Univ. of North Carolina, across [stream—ed.]
branch, S of athletic field, 9.ix.1915 W. C. Coker
1714 (NCU); Chapel Hill, Univ. of North Carolina, in
front of Dr. Wagstaff's [residence?],
s.d. W. C. Coker 1756 (NCU).
OKLAHOMA—Oklahoma Co. - Edmond, Hafer Pk.
[35.6422° N/ 97.4558° W, 327 m],
25.viii.2005 C. L. Ovrebo 4521
(CSUC, nrITS seq'd.), 20.viii.2008 C. L. Ovrebo
4754 (CSUC, nrITS seq'd.), 5.ix.2009 Felipe Wartchow
& C. L. Ovrebo s.n. (RET 599-2, nrITS &
nrLSU seq'd.), s.n. (RET 599-3, nrITS seq'd.).
TEXAS—Angelina Co. - Zavalla, north of
town by church [30.7085º N/ 93.8272º W, 37 m],
25.viii.2017 David P. Lewis 12183 (RET 809-1,
nrITS & nrLSU seq'd.).
Hardin Co. - Big Thicket Nat.
Preserve, Lance Rosier Unit [30.2609º N/ 94.5259º W,
20 m], 10.ix.2014 Talena A. Fowler 14091001
(RET 683-7, nrITS seq'd.).
Houston Co. - Grapevine, Young
residence, 30.v.2013 Brooks Young s.n.
[D. P. Lewis 10712] (RET 606-6, nrITS seq'd.).
Jasper Co. - Buna, Whitehouse
business area off US Rte. 96, 26.v.2008 D. P.
Lewis 8535 (RET 430-5, nrITS seq'd.).
Jefferson Co. - Beaumont Forest
Lawn Cemetery, 21.ix.2014 D. P. Lewis 11466
(RET 683-1).
Orange
Co. - Vidor, ca. former Lewis residence,
23.viii.1977 D. P. Lewis 1113 (F).
Polk Co. - Big Thicket Nat. Preserve, Big Sandy Unit,
4.vii.2014 D. P. Lewis 11337 (RET 682-9).
Tyler Co. - Lake Hyatt area, corner of Lake Hyatt
Rd. 4770 & Bumstead Cemetery Rd. 4800, 2.vii.2014 D.
P. Lewis 11250 (RET 682-10). |
| discussion |
As was apparently the case with Coker's collections
of this taxon, recent collections have been
inadvertently mixed with material of
Amanita
recutita sensu Coker. Apparently the
species have a tendency to grow in a common
habitat. From the existing evidence, this may
be an open area with Quercus as an available
symbiont. With color changes due to age and potential
loss of the partial veil in A. recutita sensu
Coker, the two taxa may be sufficiently similar to
the unaided eye that mixed collections have occurred
more than once. This appears to have led to
incorrect spore measurement data having been
provided by Coker
(1917) for
the present species.
The following figure provides sporograph comparison
for the two taxa of interest:
Recent collections from Oklahoma (Dr. Clark L.
Ovrebo), Texas (David P. Lewis), and Louisiana
(Logan Wiedenfeld)
have been reviewed by RET; and a number of the
have yielded a shared nrITS sequence with a very rare
form of the 5' motif for the nrLSU sequence included.
These collections appear to represent the taxon
photographed and described by Coker.
Work is on-going.
t.b.d. |
| citations |
—R. E. Tulloss |
| editors |
RET |
|
Spore data sets and their composite