1. E. J. H. Corner's watercolor of the material placed in Amanita similis by Corner and Bas.
The following is based on the original description by Boedijn
(1951) from Javan material.
The cap of Amanita similis is 50 - 120 mm wide, convex at first, then plano-convex, smooth, grayish
brown in the center, between isabelline and light brownish olive, gradually changing to honey yellow
to chamois near the margin, with a sulcate-striate margin (nearly 50%
of the radius). The volva is absent but sometimes present as a single, white,
membranous patch. The flesh is rather thin, dirty white, up to 5 mm thick over the stem, rapidly thinning
to a membrane over most of the length of the marginal striations.
The gills are free, pale or naphthalene
yellow in side view, mustard yellow to amber yellow in mass, up to 14 mm broad.
The stem is 100 - 150 × 8 - 16 mm, hollow, fibrillose, narrowing upward, grayish yellow near the top,
mustard yellow near the base, with the colors somewhat dingy above,
brighter towards the base. The ring is grayish, 20 - 35 mm from the
top of the stem, membranous, skirt-like, and falling against the stem.
The saccate volva is attached only near the base of the stem, grayish
on the outer surface, and 20 - 35 mm wide. The flesh is 2 - 3 mm thick.
The spores measure (9.5-) 10 - 12 (-14) × (6.5-) 7 - 8 (-9) µm. Spore measurements not including extremes of
length and width were called the "most common dimensions" by Boedijn.
This species was originally described from Java.
The following is based on Corner and Bas (1962) from
Malayan and Singapore material.
The cap of Amanita similis is 60 - 130 mm wide, cylindric-bell shaped at first, becoming plane to
slightly concave and subumbonate, viscidat first when moist, dark bistre to dark brownish olivaceous or olivaceous-umber
in the center, with the outer striate part varying from wine-pink to
reddish orange to pale orange or yellowish, entirely olivaceous-umber
in age, with a sulcate-striate margin (30 - 50% of the radius). The
cap gives the appearance of having innate radial fibers or streaks.
Volval remains are absent. The flesh is soft, 4 - 8 mm thick above the
stem, pale yellowish to yellowish white, deeper yellow below the cap skin.
The gills are free, crowded, 5 - 10 mm broad, pale yellow or yellowish
white in side view, with a deep yellow, orange or pinkish orange
floccose edge. The short gills are truncate,
obliquely truncate, or sometimes attenuate, plentiful, and unevenly distributed.
The stem is 100 - 180 × 6.5 - 15 mm,
narrowing upward, hollow, canary yellow to pale yellow orange or pale yellow, marked with
orange to pinkish orange or concolorous floccose-fibrillose concentric
zones below the ring and above the volva, striate and fibrillose
above the ring. The ring is skirt-like, 20 - 35 mm from the top of the stem,
thin, membranous, extending 12 - 17 mm from the stem, pinkish orange
to pale orange to orange-yellow, slightly striate above, more
yellowish and subfloccose on the underside, and rapidly collapsing. The
saccate volva is 25 - 50 × 10 - 30 mm, white, sometimes with dingy brownish
stains, rather thick, firm, with an
irregularly lobed edge, attached only at the very base of the stem, with an
indistinct internal limb placed a few millimeters above the point of attachment to the stem.
The spores measure 7.0 - 9.9 × (5.4-)
6.1 - 8.6 µm from dried material and 8 - 11 × 7 - 9 µm (or smaller)
from fresh material and are broadly ellipsoid to ellipsoid,
occasionally subglobose and inamyloid. Clamps are present at bases of basidia.
The following is based on the
description by Hongo (1975) from Japanese material.
The cap of Amanita similis is 80 - 90 mm wide, convex then expanded and somewhat umbonate, viscid at
first, innately streaked, bronze to honey yellow, darkest in the
center, with a sulcate-striate margin (30 - 50% of the radius). The
flesh is pale yellow, bright yellow underneath the cap skin especially under the umbo.
The gills are free, close, pastel yellow, 6 - 7 mm broad, with a gray-brown
floccose- crenulate edge, with decurrent lines at the top of the stem. The short gills are
The stem is 110 - 130 × 10 - 13 mm, slightly tapering upward, stuffed, maize yellow to butter yellow, with
dingy yellow incomplete concentric zones from the underside of the
ring to the top of the volval limb. The ring is superior, brownish
yellow, membranous, striate on the upper surface. The volva is white, thick
in the lower part, thinning out toward the margin.
The spores measure 7.5 - 10.5 × 5.5 - 7.5 µm are are broadly ellipsoid and inamyloid.
The Japanese material is associated with pine and oak.
Hongo's watercolor of this species (Imazeki & Hongo 1987
(plate 29)) shows a distinctly brownish tint to the stem and to the squamules that decorate it. As a consequence, there are no bright
colors on it. The ring has collapsed on the stem and is distinctly browner than the brownest yellow of the stem, more like a yellowish
General comments follow:
The three descriptions differ primarily in the color of the stem and its decoration, the color of the ring on the
stem, the color in the area of the cap striations and just at its
margin. Unfortunately we are not able to fully interpret the available
information on spore size and shape. Boedijn presents five spore
drawings with a length/width ratio ranging from approximately 1.4 -
1.6. Hongo presents two drawings in approximately lateral view with a
length/width ratio ranging from approximately 1.4 - 1.55. In both
cases, estimation of the average ratio based on the printed spore
measurement is consistent with the ratios computed from the spore
drawings—1.45 in the first case, 1.4 in the second case. The same
ratio computed from the drawing of five spores from Corner and Bas
yields a range of 1.15 - 1.4. Estimates of the average ratio from each
of the three sets of spore measurements that they give range from 1.15
- 1.25. It would appear from this evidence that the spores of the
Singapore material are proportionately broader than the spores
reported from the other two regions. We emphasize that we do not
consider that we can make a definitive statement. Unfortunately we are
unfamiliar with the material from all three areas.
≡Amanita hemibapha subsp. similis (Boedijn) Corner & Bas. 1962. Persoonia 2: 295, pl. 11, fig. 54.
The editors of this site owe a great debt to Dr. Cornelis Bas
whose famous cigar box files of Amanita nomenclatural information
gathered over three or more decades were made available to RET for computerization
and make up the lion's share of the nomenclatural information presented on this site.
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.
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 the protolog of the present taxxon and from the revision of Corner & Bas (1962).
Corner & Bas (1962): [-/-/-] 7.0 - 9.9 × (5.4-) 6.1 - 8.6 μm, Q = 1.05 - 1.40; Q = 1.20), hyaline, colorless, smooth, thin-walled, inamyloid, broadly ellipsoid to elipsoid, sometimes subglobose; apiculus proportionately rather broad; contents cloudy vacuolate to multi- or monoguttulate; color in deposit not recorded. Note: Spores reported to measure 8.0 - 11.0 — 7.0 - 9.0 μm when fresh.
Corner & Bas (1962): Solitary to gregarious. Malaysia: At 1700± m elev. Terrestrial in forest. Singapore: Terrestrial in forest, coming up soon after rains (March and August). Borneo, Indonesia: Corner reported "a large troop...in 1961 near the Mesilau River, on Mt. Kinabalu at about 1700 m alt. in oak-forest" that was not collected.
from protolog: INDONESIA: JAVA—ca. Sukabumi, Gunung Telaga [ca. 1650 m], 26.xi.1939 von Steenis s.n. (holotype implicit, BO? or L?).
Corner & Bas (1962): MALAYSIA: JOHOR—Gunong Panti, viii.1929 E. J. H. Corner s.n. (L).
NEGRI SEMBILAN—Angsi Forest Reserve, 750 m elev., 3.vii.1930 E. J. H. Corner s.n. (L).
SINGAPORE: Bukit Timah, 16.viii.1939 E. J. H. Corner s.n. (L), 18.xii.1940 E. J. H. Corner s.n. (L, watercolor drawing only), 16.ii.1943 E. J. H. Corner s.n. (L, watercolor drawing only).
The editors are grateful to Dr. Joost Stalpers for assisting us in specifying the type locality of the present species.
—R. E. Tulloss
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"Boedijn's Slender Caesar"
1. E. J. H. Corner's watercolor of the material placed in Amanita similis by Corner and Bas.
Prof. E. J. H. Corner (Singapore, illustration from original description (Corner and Bas,
1962) reproduced by courtesy of Persoonia, Leiden, the Netherlands.)
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.