The information below is based on the original description
of this species.
The fruiting bodies of A. sinocitrina are small
to medium-sized. The cap is 40-60 mm wide, convex
to applanate, gray-yellow, sometimes brownish,
with indistinct, innate, radial fibrils. It is
covered with grey to brownish, verrucose to floccose,
felty, volval patches; its flesh is
white, but turns brownish when exposed, especially in the
The gills of this species are free to subfree, crowded,
white to cream-colored; and the short gills are
attenuate and of diverse lengths.
The stipe is 60 - 90 × 5 - 10 mm, subcylindric to
attenuate upwards; its surface is white to dirty white,
covered with yellowish to yellow squamules above the
annulus, and with
whitish to grayish squamules or fibrils below the annulus;
the stipe's basal bulb is 15 - 25 mm wide, subabrupt to
abrupt, marginate, with the
upper margin covered with grayish to brownish, verrucose
to floccose volval remnants.. The annulus is membranous and superior to nearly
medium, with its upper surface cream-colored to
yellowish and lower surface whitish to grayish or
Spores of A. sinocitrina measure (5.5-) 6.0 - 7.5
(-8.0) × (5.0-) 5.5 - 7.0 (-7.5) µm and are
globose to subglobose, and amyloid. Clamps are not
present on the bases of basidia.
Amanita sinocitrina was originally described
from central China. It occurs in mixed
forests ith broad-leaved trees and conifers.
Its distribution range is still unknown.
Amanita sinocitrina is characterised by its
small to medium-sized basidiome with a gray-yellow
pileus, grey to brownish
volval remnants, a whitish to yellowish annulus, a
subabrupt to abrupt, marginate bulb on the base of
the stipe, and small basidia and spores. It
is related to taxa such as
However, A. sinocitrina differs from the
European A. mappa by its differently
colored pileus with somewhat darker colored volval
remnants, smaller basidia and significantly smaller
Amanita sinocitrina is also similar to
var. grisea (Hongo) Hongo,
(Coker) Tulloss et al., A. brunnescens
G. F. Atk., A. brunnescens f.
straminea E.-J. Gilbert,
Singer ex Singer and A. asteropus Sabo
ex Romagn. However, A. citrina
described from Japan, has a darker colored pileus,
pallid yellow annulus, larger basidia and larger
spores. Amanita lavendula, originally
described from the U.S. and other similar taxa in
North America are distinguished from A.
sinocitrina by, among
other features, its lavender staining fruiting body
and (in the case of A. lavendula) somewhat
Amanita brunnescens from eastern North
America usually has larger basidiomes with brown,
innate radial lines on the pileus covered with
whitish to pallid volval remnants, a white
stipe with a usually longitudinally cleft bulb,
longer basidia, and
larger spores. Amanita brunnescens
f. straminea has a
differently colored pileus and stipe, and larger
brunnescens var. pallida and A.
aestivalis, both described from eastern North
a paler colored pileus, a longitudinally splitting
bulb, larger basidia
and larger spores. Amanita asteropus,
described from Europe, has
a differently colored pileus with differently
colored volval remnants,
and without innate, radial fibrils, a
longitudinally splitting bulb,
trama or surface of stipe turning rapidly
brown-orange when injured, and larger
spores.—Zhu L. Yang
and R. E. Tulloss
Zhu L. Yang, Z. H. Chen & Z. G. Zhang in Chen, Z. H., Zhu L. Yang & Z. G. Zhang. 2001. Mycotaxon 79: 275, figs. 1-4.
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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).
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where data is missing or uncertain.
The following description is derived entirely from the
NOTE: Spore data from papers by Z. L. Yang are
presented following his use of the "Times New Roman"
face for "Q" and "Q'"—respectively,
protolog: Basidiomes small to
protolog: (30-) 40 - 60 mm wide,
gray-yellow [3B3-6, 3C4-5, Deep Olive-Buff, Dark
Olive-Buff], sometimes brownish [5C4-6], with indistinct
innate, radial fibrils; contents white, sometimes
very slowly brownish when cut or bruised; margin
universal veil as felty patches, verrucose to
floccose, 2 - 5 mm wide, 1± mm thick,
gray to brownish, randomly arranged, often detersile in
protolog: free, crowded, white to
pale cream; lamellulae attenuate, evenly
protolog: 60 - 90 × 5 - 10 mm
[length includes length of bulb],
white to sordid white, subcylindric or slightly narrowing
upward, with slight flaring at apex, covered with yellowish
squamules above partial veil, with whitish to gray sqamules
below partial veil; bulb abrupt to subabrupt,
marginate, 15 - 25 mm wide;
context white, very slowly turning brownish when
exposed especially in stipe's bulb; partial veil
persistent, superior to submedian, membranous,
above whitish, to cream or pale yellowish,
whitish to grayish or brownish below; universal
veil covering bulb
margin, grayish to brownish, sometimes submembranous
and then forming brief limb on bulb margin.
Odor and taste not recorded.
protolog: 40 - 90 μm thick;
suprapellis 20 - 50 (-70) μm thick, strongly
gelatinized, colorless, hyaline, with filamentous hyphae
1.0 - 5.0 μm wide;
subpellis 20 - 40 μm thick, with filamentous hyphae
3.0 - 10.0 (-12.0) μm wide; ungelatinized filamentous
hyphae subradially and compactly arranged, subhyaline,
colorless or with brownish vacuolar pigment, with terminal
segments not distinctly inflated; vascular hyphae
protolog: bilateral, divergent;
wcs = 30 - 40 μm; central stratum
with filamentous hyphae 2.0 - 7.0 μm wide fairly
abundant to abundant, with inflated cells [probably
intercalary—ed.] 60 - 90 × 20 - 25 μm,
with vascular hyphae rare; lateral stratum with elements
diverging at angle of ca. 30° to 45°, with
filamentous hyphae 3 - 8 μm wide fairly abundant to
abundant, with inflated cells fairly abundant to
abundant fusiform to long ellipsoid (55 - 100 ×
15 - 20 μm); clamps absent.
protolog: 20 - 40 (-50) μm thick,
with inflated cells subglobose to ovoid to short ellipsoid
[8 - 25 (-30) × 7 - 20 (-25) μm] in 2 - 3 (-4)
layers, with barely inflated hyphal segments occasional
[3 - 7 μm wide].
(10-) 25 - 35 (-40) × (8.0-) 8.5 - 10.5 (-11.5)
μm, 4-, and rarely 1- or 2-sterigmate, with
sterigmata 3.0 - 5.0 μm long; clamps lacking.
protolog: On pileus: with
elements irregularly arranged; filamentous hyphae
2 - 7 μm wide, fairly abundant, frequently septate,
thin-walled, hyaline, colorles or occasionally with
brownish to brown vacuolar pigment;
inflated cells globose to subglobose or ovoid (20 - 80
× 20 - 60 μm) or ellipsoid (40 - 60 ×
25 - 30 μm), terminal singly or in chains of 2 - 3, with
walls thin or up to 0.5 μm thick, hyaline,
colorless or with brownish to grayish vacuolar pigment;
vascular hyphae rare. On bulb margin:
similar to that on pileus, but with greater proportion
of filamentous hyphae.
protolog: [135/6/5] (5.5-)
6.0 - 7.5 (-8.0) × (5.0-) 5.5 - 7.0 (-7.5) μm,
(Q = 1.0 - 1.15 (-1.20);
Q = 1.08 ± 0.05), colorless,
hyaline, thin-walled, smooth, amyloid, globose to
subglobose, rarely broadly ellipsoid; amyloid
proportionately small; contents not recorded;
color in deposit not recorded.
protolog: At 900 - 1200 m
elev. In mixed forests of central China.
HUNAN—Chenzhou (prefecture level) City -
Yizhang Co., Mangshan, 900 m. elev., 24.vi.1997 Z. H.
Chen 3691 (holotype, HKAS 36983), 29.ix.1981 Y. C. Zong
& Z. L. Mao 65 (paratype, HMAS 42248, as A.
porphyria in [Mao et al.
27.ix.1981 X. L. Mao & Y. C. Zong 20 (paratype,
HMAS 52613, as A. porphyria in [Mao et al.
Yizhang Co., Mangshan, 1200 m elev., 27.vii.1997 Z. H.
Chen 3712 (paratype, HKAS 36982).
The dark cap of the present species, the color of its
partial veil, the color of its volval fragments, and the
small size of its spores combine to segregate this taxon
from other taxa in stirps
—R. E. Tulloss
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