Fruiting bodies of Amanita kotohiraensis are small to medium-sized.
The cap of Amanita kotohiraensis is (30-) 50 - 80 mm wide, convex, white, sometimes cream in the center; and it is covered with white, felty to patchy volval remnants; the margin is appendiculate; and the context is white.
The gills are free and yellowish; the short gills are attenuate.
The stipe is 60 - 130 × 5 - 15 mm, subcylindric or attenuate upwards, with a surface and context that are white. The stipe's basal bulb is 15 - 40 mm wide and subglobose, with its upper part covered with white, verrucose, granular to subconic volval remnants. The annulus is white and fugacious.
The smell of the present species is reported as disagreeable or unpleasant. No taste has been reported.
The spores of this species measure (7.0-) 7.5 - 9.5 (-11.0) × 5.0 - 6.5 (-7.0) µm and are broadly ellipsoid to ellipsoid and amyloid. Clamps are common at the bases of basidia.
Amanita kotohiraensis was
originally described from Japan. It is not uncommon in China.—Zhu L. Yang
Zhang et al. (2010), Key Lab. Biodivers. Biogeogr., Kunming Inst. Bot., Yunnan, China
TMI; isotype, TNS
Chen, Z.-H., Z. L. Yang and Z. G. Zhang. 2001. Mycotaxon 79: 279, figs. 5-8.
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 not directly from the protolog of the present taxon follows Chen et al. (2001).
NOTE: Spore measurements from papers by Z. L. Yang use his "Times New Roman" face for "Q"
and "Q'"—respectively, "Q" and "Q.
from protolog: [28/-/1] 7.0 - 10.0 × 5.5 - 6.5 μm, (Q = 1.30 - 1.70); Q = 1.50),
amyloid, ellipsoid to elongate; apiculus not described; contents as one "oleiferous drop"; color in deposit not reported.
from Chen et al. (2001): [185/8/5] (7.0-) 7.5 - 9.5 (-11.0) × 5.0 - 6.5 (-7.0) μm,
(Q = (1.21-) 1.27 - 1.60 (-1.73); Q = 1.44 ± 0.10),
hyaline, colorless, smooth, thin-walled, amyloid, broadly ellipsoid to ellipsoid, rarely elongate;
apiculus proportionately small; contents not reported; color in deposit not reported.
Solitary or in small groups. Japan: Under Castanopsis cuspidata in mixed forests. China: At 900± - 1200± m elev. On ground in mixed forests.
from protolog: JAPAN: SHIKOKU—Kagawa Prefecture - Kotohira-cho, Kotohira-yama, 13.vii.1998 S. Mitani & E. Nagasawa [Nagasawa 98/59] (holotype, TMI; isotype, TNS).
Chen et al. (2001): CHINA: ANHUI—Huangshan (prefecture level) City - Huangshan District, unkn. loc., 30.viii.1957 S. C. Teng 5150 (HMAS 20106).
HUNAN—Chenzhou (prefecture level) City - Yizhang Co., Mangshan, 900 m elev., 7.vii.2000 Z. H. Chen 3677 (HKAS 37051); Yizhang Co., Mangshan, 1200 m elev., 24.vii.1997 Z. H. Chen 3702 (HKAS 36995), 6.vii.2000 Z. H. Chen 4006 (HKAS 36996).
JIANGSU—Nanjing (sub-provincial) City - former city of Nanjing, Lingusi woods, 17.viii.1957 S. C. Teng 4923b (HMAS 19941b).
Zhang et al. (2010) vouchers for sequencing: CHINA: GUANGDONG—Guangzhou (sub-provincial) City - Unkn. Distr., Baiyunshan, s.d. unkn. coll. s.n. (MHHNU 7112).
HUNAN—Chenzhou (prefecture level) City - Yizhang Co., Mangshan, s.d. unkn. coll. s.n. (MHHNU 6998).
—Zhu L. Yang
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