1. Amanita angustilamellata, drawing with type collection (FH), from Tjibodas, Java, Indonesia.
2. Amanita angustilamellata, Singapore.
3. Amanita angustilamellata, Singapore.
The following is based on the description by Boedijn (1951) and the original description by von Höhnel (1914. Sitzungsber. Kaiserl. Akad. Wiss. Wien, Math.-Naturwiss. Kl., Abt. I 123: 74).
The cap of A. angustilamellata is 40 - 90 mm wide, smoke brown, darkest in the center (original description) or gray, darkest in the center about "drab", gradually fading to light drab to smoky-gray towards the margin (Boedijn), convex to plano-convex, sometimes with a slightly subumbonate, matte, with a sulcate-striate margin (about 50% of the radius). The volva is either absent or present as a few large, white patches. The flesh is thin, white, 2 - 3 mm thick over the stem, and rapidly thinning toward the margin.
The gills are free, white or about pale pinkish buff, 3 - 7 mm broad in the middle.
The stem is 90 - 125 × 7 - 15 mm, narrowing upward, dirty white to whitish, hollow, nearly smooth, with some indistinct dark fibrils near the base. The diameter of the stuffed part of the stem is up to 11 mm wide. The saccate volva is attached to the stem only at the base and 45 -51 × 12- 14 mm.
The spores measure 9 - 12 µm in length and are globose according to Boedijn. According to Corner and Bas (1962) the spores from Singapore material measured 11 - 13 (-15) µm and are "globulose" and inamyloid. Z. L. Yang's unpublished study of the type (Farlow Herbarium) yielded these measurements: 11.0 - 14.0 (-15.0) × (10.0-) 10.5 - 13.0 (-14.5) µm, globose to subglobose. Yang (1997) reported the following spore data from southwestern Chinese material: (9.0-) 9.5 - 11.0 (-12.0) × (8.0-) 9.5 - 10.5 (-11.5) µm, globose or (infrequently) subglobose and inamyloid. Yang reports that clamps are absent at bases of basidia.
This species was originally described from Java (Indonesia) and has since then been reported from Singapore, Sri Lanka, Thailand, and southwestern China (Yang).
Variations in spore measurements suggest that not all the material studied falls into a single species. However, sample sizes are so small that no conclusion can be drawn.—R. E. Tulloss
≡Amanitopsis vaginata var. angustilamellata Höhn. 1914. Sitzungsber. Kaiserl. Akad. Wiss. Wien, Math.-Naturwiss. Kl., Abt. I 123: 74.
non "Amanita angustolamellata Herrfurth" [Never intended as the name of a taxon, provided as a fictitious example only.]
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.
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.