The following is based
on Corner & Bas (1962)
and Boedijn (1951).
The cap of A. javanica is 60 - 85 mm wide, orange yellow to ochre-yellow, sometimes with a reddish
brown tinge, antique brown to maize yellow to raw sienna between orange
and xanthene orange to yellow ochre in the center, gradually changing
towards the margin to light cadmium to between apricot yellow and empire
yellow to light orange yellow or deep chrome, strongly convex at first,
later plano-convex, umbonate, with a sulcate-striate margin (about 50% of
the radius). The flesh is off-white, 4 - 6 mm thick above the stem, and
rapidly thinning to a membrane.
The gills are free, yellow in side view, orange yellow in mass, and 8 - 12 mm broad.
The stem is 90 - 130 × 10 - 14 mm, narrowing upward, yellow (for example, near apricot yellow), decorated with orange
buff scales. The ring is 20 - 30 mm from the top of the stem, skirt-like, hanging loosely, orange
buff, and finely striate on the upper surface. The saccate volva is
off-white, 20 - 50 × 30 - 35 mm and up to 3 mm thick.
Spores measured by Boedijn 8 - 12 × 6 - 8
µm and are ellipsoid and inamyloid. Clamps are present at bases of
basidia. Spores measured by RET from Japanese material are as follows: (9.2-) 10
- 13 (-16) × (6.5-) 7.2 - 8.2 (-10) µm.
This species was originally described from Java. The species currently widely reported from southeast Asia (Japan,
China, Nepal, and northern India); however, RET and ZLY have reservations
concerning whether the mainland material is indeed the same species as A.
javanica (see below). In Japan, the species reported as A. javanica
occurs in pine-oak forests (Pinus densiflora and Quercus
serrata). No associated plants were mentioned by Boedijn.
The present species is placed in Amanita stirps Hemibapha.
It was mentioned above that the editors of these
pages have some concern over whether species reported as A. javanica
in China and Japan are indeed the same as the entity described by Boedijn.
The mainland material has spores as follows: (8.5-) 9.0 - 12.5 (-16.0) × (6.3-) 6.5 - 8.5 (-10.0) µm and are
broadly ellipsoid to ellipsoid, rarely elongate. In this entity, the umbo
is often the same color as the cap's margin, and the cap is often
described as entirely "golden yellow." This golden yellow
Slender Caesar is seasonally common in some markets in Yunnan Province,
China. Unfortunately, as far as we are aware, all known illustrations
purporting to show the present species show, instead, the mainland entity.
—R. E. Tulloss and L. Possiel
(Corner & Bas) T. Oda, C. Tanaka & Tsuda. 1999. Mycoscience 40: 64.
=Amanita hemibapha sensu Boedijn. 1951. Sydowia 5: 320.
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 entirely from the protolog of the present taxon, which must be taken to include the description of Boedijn (1951) under the misapplied name "Amanita hemibapha".
60 - 85 mm wide, with color varying extensively, darkest over disc (about Antique Brown or Maize Yellow or Raw Sienna or between Orange and Xanthine Orange or Yellow Ocher), toward the margin gradually changing to Light Cadmium Yellow or between Apricot Yellow and Empire Yellow or Light Orange Yellow or Deep Chrome Yellow smooth; context dirty white, 4-6 mm thick near stipe, about 3 mm at mid-radius, "gradually thinning out near the margin" [inconsistent with long marginal striations—ed.]; margin sulcate-striate (0.5R); universal veil [apparently absent—ed.].
free, yellow, about Empire Yellow or between Baryta Yellow and Pinard Yellow, 8 - 12 mm broad at mid-length, with edges orange-yellow.
90 - 130 × 10 - 14 mm, about Apricot Yellow above partial veil, below yellow (between Apricot Yellow and Empire Yellow or between Empire Yellow and Pinard Yellow), at first covered with orange buff appressed scales, becoming glabrous, narrowing upward; context hollow: partial veil orange-buff, dependent, lax, finely striate, about 20 - 30 mm below apex; universal veil as saccate volva, free, sheathing, 20 - 50 × 30 - 35 mm, with limb up to 3 mm thick.
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.