Amanita orientigemmata - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita orientigemmata
name status nomen acceptum
author Zhu L. Yang & Yoshim. Doi
english name "East Asian Gemmed Amanita"
intro

The original description of this species can be found in (Zhu L. Yang & Yochim. Doi, 1999).

cap

The fruiting bodies of A. orientigemmata are small to medium-sized. The cap is 50 - 100 mm wide, at first hemispherical, then becomes convex to plano-convex, occasionally slightly depressed at center, moderate greyish yellow to light yellow, and somewhat darker in the center. It is covered with felty, floccose patches or small subconical warts which are 1 - 4 mm wide, up to 1.5 mm high, and whitish. The cap's margin is short-striate and nonappendiculate. Its flesh is white.

gills

The gills of this species are free, crowded, white to cream-colored; and the short gills are truncate and of diverse lengths.

stem

The stem is 50 - 110 × 10 - 15 mm, subcylindric to attenuate upwards; its surface is whitish to white and covered with fibrillose squamules. The stem's basal bulb is 20 - 30 mm wide, ovate to subglobose; and its volva is short and appressed limbate or is a floccose, white to yellowish group of patches or warts near the bulb's apex. The annulus is white to yellowish, and often torn from the stem during expansion of the pileus.

spores

Spores of A. orientigemmata measure (7.5-) 8.0 - 10.0 (-11.0) x (6.0-) 6.5 - 7.5 (-8.0) µm and are broadly ellipsoid to ellipsoid and inamyloid. Clamps are present on the bases of basidia.

discussion

Amanita orientigemmata occurs in mixed forests with broad-leaved trees and conifers. Its distribution range is from Japan to China.

Amanita orientigemmata is characterized by its grayish yellow to light yellow pileus with whitish, felted volval patches or warts, inferior and fugacious annulus, limbate volva, inamyloid, broadly ellipsoid to ellipsoid spores, and the presence of basidial clamps.

It differs from A. gemmata (Fr.) Bertillon in its presence of clamps, slightly smaller spores, and different structure of volval remnants on the cap. The volval remnants on cap of Amanita gemmata from Europe dominantly consist of irregularly to subradially arranged, filamentous hyphae, mixed with scattered to locally fairly abundant inflated cells.

In Japan, the species was originally described from Fir-Chinkapin (Abies-
Castanopsis) forest.  Amanita orientigemmata has been collected in coniferous as well as mixed and broadleaved forests in northeastern and southeastern China. - Zhu L. Yang

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