The fruiting bodies of A. clarisquamosa are usually medium-sized to large. The cap is 40-100 mm wide,
convex to applanate, dirty white to yellowish brown to brownish, with
an appendiculate and shortly striate margin; it is covered with brownish to grey-brown, patch-like volval remnants;
its context is white, unchanging or barely changing.
The gills of this species are free to subfree, crowded, white to
cream-colored but become greyish, grey brown to chocolate brown when
dried; and the short gills are truncate and of diverse lengths.
The stipe is 60 - 130 × 10 - 20 mm, subcylindrical to attenuate upwards;
its surface is white to dirty white and covered with grey-brown
furfuraceous to floccose squamules; the stipe base is not enlarged and
basal bulb is not present. The volval remnants form a sac at the base
of the stipe; the outer surface of the sac is white to dirty white,
and the inner surface is dirty white. The annulus is superior and fugacious.
Spores measure (9.5-) 10.0-13.5 (-14.0) × (5.5-) 6.0-7.0 µm and
are ellipsoid to long ellipsoid and amyloid. Clamps are not present on the bases of basidia.
Amanita clarisquamosa was originally described from Japan. It also occurs in China. It grows
in mixed forests with broad-leaved trees and conifers.
Amanita clarisquamosa is very similar to A.
avellaneosquamosa (S. Imai) S. Imai and A. volvata (Peck) Lloyd.
However, A. clarisquamosa differs from A. avellaneosquamosa by its
shorter striations on the pileal margin, more densely arranged
lamellae and larger spores. The fruit-body of A. volvata becomes
reddish brown when cut, and has much thicker subhymenium consisting of
3-4 layers of cells and somewhat smaller spores. Furthermore, the
inner layer of the volval remnants consist of a large number of
loosely arranged, fusiform, broadly clavate to ellipsoid inflated cells.—Zhu L. Yang
(S. Imai) S. Imai. 1938. J. Fac. Agric. Hokkaido Univ. 43(1): 29, pl. 1 (fig. 8).
"Larger-Spored East Asian Amidella"
≡Amanitopsis clarisquamosa S. Imai. 1933. Bot. Mag. (Tokyo) 47: 430.
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.
Weiss et al. (1998), Lehrstuhl für Spezielle Botanik und Mykologie, Bot. Int., Univ. Tübingen
in herb. S. Imai (SAP) (implicit); isolectotype, in herb. E.-J. Gilbert (lost)
E.-J. Gilbert. 1941. op. cit.: 294. [Gilbert states that he has half a basidiocarp of the type in his herbarium. He also refers to the spore illustrations in the first part of the work published in 1940. In the caption to this spore illustration in particular, a specific collection is cited. This must be the collection of which Imai had sent Gilbert a part. Hence, this collection is implicitly designated lectotype.]
Z. L. Yang. 1997. Biblioth. Mycol. 170: 122, figs. 100-103.
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.
Following material not directly from the protolog of the present taxon or cited as from the work of Yang or others 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
composite of all spore data collected by RET: [179/8/4] (6.5-) 9.0 - 12.7 (-16.1) × (5.5-) 6.0 - 8.2 (-11.0) μm, (L = 9.9 - 11.7 (-12.3) μm; L' = 10.9 μm; W = 6.4 - 7.6 (-8.3) μm; W' = 7.0 μm; Q = (1.15-) 1.32 - 1.77 (-2.02); Q = 1.50 - 1.66 (-1.69); Q' = 1.58), hyaline, colorless, smooth, thin-walled, amyloid, ellipsoid to elongate, rarely broadly ellipsoid, rarely cylindric, sometimes swollen at one end, sometimes constricted, often adaxially flattened, with "giant" spores sometimes present; apiculus sublateral, cylindric, proportionately small; contents ??; ?? in deposit.
Solitary or in small groups. China: At 2900 m elev. In forest with Quercus and Abies species. India: At 1850± - 2750± elev. In humus rich soil under Myrtica esculenta, Quercus lanata, and Rhododendron arboreum or in pure Abies pindrow forest on W slope or on road bank in coniferous forest (Picea smithiana, Abies pindrow, and Pinus wallichiana) on N slope. Japan: ??. Thailand: In Pinus-Castanopsis forest.
from Yang (1997):
CHINA: YUNNAN—Yulong Nakhi Autonomous Co. - Lijiang (prefecture level) City, Yufengsi, 31.vii.1995 Z. L. Yang 2106 (HKAS 29514).
from Yang (2000): CHINA: JIANGSU—Nanjing (sub-provincial) City - former city of Nanjing, unkn. loc., 28.vi.1936 H. N. Shen 312 (formerly "IBN 5722"; BPI 751333, as "Amanitopsis volvata").
RET: INDIA: HIMACHAL PRADESH—Narkanda,6.viii.1964 C. Bas 4066 (L), 11.viii.1964 C. Bas 4118 (L).
UTTARAKHAND—Garhwal - Pauri Distr., Dandapani, 20.ix.1993 V.K. & R. P. Bhatt M-20168 (GUH).
THAILAND: CHIANG MAI PROV.—Om Koi, 12.ix.1999 D. Arora 99-281 (RET 351-6; SFSU).
A figure showing the sporograph comparison of the present taxon and A. avellaneosquamosa can be found on the technical tab of the latter species.
In the past, the present species was confused with the North American taxon A. volvata. A figure comparing sporographs of the two species follows.
—Z. L. Yang & R. E. Tulloss
Information to support the viewer in reading the content of "technical" tabs
can be found here.
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.