The cap of A. subfrostiana is 40 -
70 mm wide, convex to applanate, red over disc, and
becoming pale orange towards the margin. The volval
remnants on pileus are floccouse to felty, yellow to
yellowish or orange; the margin has long striations.
The lamellae are white to
cream-colored, and the short lamelullae are usually truncate.
The stem is 60 - 100 × 10 - 15 mm,
subcylindric or tapering upwards. The basal bulb is
subglobose to ovoid, 10 - 30 mm wide; its upper part is
covered with yellowish floccose volval remnants often
forming a short limb. The ring is membranous, its
upper surface is whitish and its lower surface is yellowish.
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The spores of A. subfrostiana are (8.0-) 8.5 - 10.5 (-12.0) x (7.0-)
8.0 - 10.0 (-10.5) µm, globose to subglobose, inamyloid,
colorless, hyaline, thin-walled, smooth. There are clamps at bases of basidia.
Amanita subfrostiana grows in coniferous or mixed forests.
To date it has been found only in southwestern China.
Amanita frostiana (Peck) Sacc. is similar to
the present species. However, A. frostiana, originally described from North
America, usually has a less saturated, yellow-orange to orange-yellow cap,
shorter striations along the cap margin, and
paler-colored volval remnants on the cap.—Zhu L. Yang
Zhu L. Yang. 1997. Biblioth. Mycol. 170: 12, figs. 1-4.
Weiss et al. (1998), Lehrstuhl für Spezielle Botanik und Mykologie, Bot. Int., Univ. Tübingen
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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
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NOTE: Spore data from papers by Z. L. Yang are presented following his use of the "Times New Roman" face for "Q" and "Q'"—respectively, "Q" and "Q."
From protolog: [240/8/5] (8.0-) 8.5 - 10.5 (-12.0) × (7.0-) 8.0 - 10.0 (-10.5) μm, (Q = 1.0 - 1.13 (-1.22); Q = 1.06 ± 0.04), globose to subglobose, rarely broadly ellipsoid, inamyloid, colorless, hyaline, smooth, thin-walled, sometimes with wart-like to network-like interior ornamentation (?of the cell wall?); apiculus 1.0 - 1.5 μm long.
Solitary or in small groups. At 2360± m elev. In conifer forest or in mixed forest.
from protolog: CHINA: XIZANG AUTONOMOUS REGION (TIBET)—Unkn. Prefecture. - Unkn. Co., unkn. loc., 20.viii.1983 Y. G. Su (paratype, HKAS 16416).
YUNNAN—Dali Bai Autonomous Prefecture - Binchuan Co., Jizushan, 2.viii.1985 G. P. Xiao 89 (paratype, HKAS 15431), 9.viii.1985 G. P. Xiao 470 (paratype, HKAS 17038), 1.ix.1992 Y. Xiang 4 (holotype, HKAS 32513); Binchuan Co., Jizushan, 2360 m elev., 4.viii.1985 G. P. Xiao 296 (paratype, HKAS, 17266).
Zhang et al. (2004) voucher for sequencing: CHINA: YUNNAN—Unkn. loc., s.d. unkn. coll. s.n. (HKAS 34551).
—Zhu L. Yang
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