Fruiting bodies of Amanita
pseudovaginata are small to medium-sized. The cap is
30 - 60 mm wide, applanate, sometimes slightly depressed
over disc, greyish, sometimes with brownish tinge, and
occasionally nearly white; it is glabrous or covered with
greyish to whitish, felty to patchy volval remnants. The
cap margin is striate (20% - 30% of the radius) and
non-appendiculate, and the context is white.
The gills are free, white, and
sometimes become greyish when dried; the short gills are
The exannulate stem 50 - 80 × 5 -
12 (-15) mm, subcylindric or slightly attenuate upwards,
fistulose, with a surface that is white to dirty white
and nearly smooth; the stipe lacks a basal bulb. At the
base of the stip, the volva is saccate, 15 - 20 × 10 - 15
(-25) mm, 1 - 1.5 mm thick, membranous, with an outer
surface that is white to whitish, with yellowish brown
spots. The upper half of the volva often becoming greyish
when mature; the inner surface is usually greyish, but
sometimes whitish; and there is an internal limb on the
The spores [from east Asia] measure (8.5-) 9.5 - 12.5 (-14.0) × (7.0-) 8.0 - 10.5 (-11.0) µm and are subglobose to broad ellipsoid and inamyloid. Clamps are absent from the bases of basidia.
[Spores from a small amount of northern Indian material measure (9.4-) 10.4 - 12.3 (-14.0) × 8.5 - 10.9 (-11.3) µm.—RET]
The species was originally described from Japan. It is widely distributed in China, and was recently reported from northern India.—Zhu L. Yang.
Hongo. 1983. Mem. Fac. Liberal Arts Shiga Univ. 33: 39, fig. 69(4-7).
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.
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 predominantly from from the protolog of the present taxon, (Yang 1997), (Yang and Doi 1999). Data on Indian material is based upon original research by R. E. Tulloss.
NOTE: Spore measurements from papers by Z. L. Yang use his "Times New Roman" face for "Q" and "Q'"—respectively, "Q" and "Q."
from type study of Yang and Doi (1999): [50/2/1] (9.5-) 10.5 - 13.0 × 8.0 - 9.0 (-9.5) μm, (Q = (1.20-) 1.25 - 1.51 (-1.54); Q = 1.37 ± 0.08), hyaline, colorless, smooth, thin-walled, inamyloid, broadly ellipsoid to ellipsoid; apiculus small; color in deposit not recorded.
from Yang (1997): [271/12/5] (8.5-) 9.5 - 12.5 (-14.0) × (7.0-) 8.0 - 10.5 (-11.0) μm, (Q = (1.01-) 1.05 - 1.33 (-1.43); Q = 1.19 ± 0.09), colorless and hyaline to subcolorless and subhyaline, inamyloid, smooth, thin-walled, subglobose to broadly ellipsoid, rarely globose, [occasionally—ed.] ellipsoid; apiculus small; color in deposit not recorded.
RET: [20/1/1] (9.4-) 10.4 - 12.3 (-14.0) × 8.5 - 10.4 (-11.3) μm, (L = 11.2 μm; W = 9.1 μm; Q = 1.09 - 1.34 (-1.44); Q = 1.23), ??, inamyloid, subglobose to broadly ellipsoid to ellipsoid, adaxially flattened; apiculus sublateral, truncate-conic to subcylindric; contents ??; color in deposit not recorded.
Solitary or in small groups. China: At 1600 - 1900 m elev. In forests with Pinus yunnanensis. Japan: In Pinus-Quercus forest.
from protolog: JAPAN: HONSHU—Kyoto Prefecture - Uji-shi, Ikeno-o, along road cuts, 4.viii.1981 T. Hongo 6134 (holotype, in herb. Hongo => TNS F-237282).
Yang (1997): CHINA: GUIZHOU—Guiyang (prefecture level) City - Huaxi District, 7.vii.1988 J. Z. Ying et al. 261 (HMAS 57971, as A. vaginata in Ying & Zang 1994: 140).
XIZANG AUTONOMOUS REGION (TIBET)—Nyingchi Prefecture - Chayu Co., Xiachayu, 1.ix.1976 M. Zang 717 (HKAS 5717, as A. vaginata in Mao (1990): 215).
YUNNAN—Honghe Hani and Yi Autonomous Prefecture, Yuanyang Co., Xinjie (Xiao), 26.viii.1991 K. K. Chen 226 (HKAS 23548). Kunming (prefecture level) City - Unkn. District, unkn. loc., 5.viii.1974 M. Zang 943 (HKAS 943). Qujing Prefecture - Qujing City (formerly Qujing Co.), Xiaohe, 6.viii.1995 Z. L. Yang 2198 (HKAS 29524).
Yang and Doi (1999): JAPAN: HONSHU—Kyoto Prefecture - Uji-shi, Ikeno-o, along road cuts, 4.viii.1981 T. Hongo 6134 (holotype, in herb. Hongo => TNS F-237282).
Zhang et al. (2004) voucher for sequencing: CHINA: YUNNAN—Unkn. loc., s.d. unkn. coll. s.n. (HKAS 38323).
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.