Amanita longistriata - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita longistriata
name status nomen acceptum
author (S. Imai) E.-J. Gilbert
english name "Imai's Slender Caesar"
intro On this page, each description is duplicated.

The first of each pair of descriptions is based on recent collections from Japan by Bas, Yang, and Doi (1999).

The second of each pair of desriptions is based on the description of Gilbert (1940) and the original description by Imai (1938).
cap Bas, Yang, & Doi: The cap A. longistriata is 30 - 90 mm wide, grayish to grayish buff, sometimes with a slight pinkish tinge, sometimes grayish brown to brownish in the center, hemispherical at first, convex to plano-convex, with or without a small umbo, with a long-striate margin ((20-) 30 - 50% of the radius).  The flesh is white.

Gilbert & Imai: The cap of A. longistriata is 50 - 100 mm wide, smoky-umbrinous or clove-brown, darker in the center, convex at first, then plane, viscid when moist, smooth,  with a long striate margin. Volval remnants are absent. The flesh is thin and white.
gills Ba, Yang, & Doi: The gills are free or even remote from the stem, rather distant, up to 11 mm broad, beautifully pale clear pink at first, later paler pink, with a minutely white, uneven, and floccose edge.  The short gills are obliquely truncate.

Gilbert & Imai: The gills are free, crowded, broad, and white becoming pale pinkish.
stem Bas, Yang, & Doi: The stem is 90 - 180 × 5 - 15 mm, close to cylindric or slightly tapering upward, pinkish-white at first, becoming white, with a proportionately broad central cylinder.  The ring is in the upper part of the stem or almost at the midpoint, membranous, thin, and whitish.  The volval sac is 20 - 30 (-40) × 10 - 20 mm, 0.5 - 1.5 mm thick, membranous, white or whitish on the exterior, with an internal limb placed above the point at which the stem is attached to the volva.

Gilbert & Imai: The stem is 100 - 180 × 8 - 15 mm, narrowing upward, white, stuffed at first, then hollow, mostly undecorated, minutely floccose to minutely scaly below the ring, minutely powdery above the ring.  The ring is membranous, placed high on the stem, skirt-like, rather broad, and white.  The saccate volva is ample, 20 - 50 × 10 - 35 mm, for the most part free from the stem, connected only at the stem base, rather thick, persistent, proportionately large, and white on the outer surface, palely concolorous to the cap on the inner surface.
odor/taste The odor is said to be indistinct.  The taste is said to be mild.
spores Bas, Yang, & Doi: The spores (8.0-) 9.0 - 12.0 (-13.5) × (7.5-) 8.0 - 10.0 (-11.0) µm and are dominantly broadly ellipsoid, sometimes ellipsoid or subglobose and inamyloid.  Clamps are often present at bases of basidia.

Gilber & Imai: The spores measure 12.5 - 15 × 10 - 12.5 µm and are broadly ellipsoid and inamyloid.  Clamps are almost certainly present at bases of the basidia.  Spores measured from the Gilbert's drawings (1941) are: 10.5 - 12.6 × 8.8 - 10.5 µm.
discussion This species was originally described from Japan.  It has also been reported from South Korea and China.  It occurs solitarily or in groups in several forest types, sometimes with fir (Abies).

ZLY points out that this species appears to be closely related to A. incarnatifolia Zhu L. Yang.  Amanita longistriata can be placed in Amanita stirps Hemibapha.—Z. L. Yang, R. E. Tulloss, and L. Possiel
brief editors RET

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