This provisional taxon was originally based on a collection from the northeastern U.S., and all collections that have been placed in it since have been from a region extending from Connecticut to New Hampshire. Collections attributed to another provisional taxon A. sp-S01 have been made in the same region, and the question arises as to whether an inappropriate distinction has been made. See also ?Amanita russuloides.
The cap of this species is 38 - 62 mm wide, yellowish with darker disc, tacky to viscid, and shiny. The striations on the cap margin extend to about 20 to 30% of the cap's radius. The cap often bears thin and narrow patches of white or whitish volva.
The gills are free to narrowly adnate, subcrowded to crowded, pale yellowish white to cream in mass, and white in side view. The short gills are truncate to rounded truncate.
The stuffed or solid stem of A. sp-N19 is 54 - 87 × 6 mm, white and may turn brown from handling. Its flesh is white and unchanging when cut or bruised. It bears a bulb that is 15 - 19 × 11 - 14 mm and is ovoid to ellipsoid. There is a small, whitish, membranous ring on the stem somewhere between mid-stem and about one-third of the stem's length from its top. The ring usually collapses on the stem or disappears completely. The white volva takes the form of a very narrow thin collar or a membranous flap of tissue arising from the bulb with the flap's upper tip up to 25 mm above the bottom of the bulb.
The odor has been described as "fungoid" or lacking.
The spores of A. sp-N19 measure (8.8-) 9.5 - 11.5 (- 13.2) × (6.0-) 6.5 - 7.8 (-8.0) µm and are ellipsoid to elongate and inamyloid. Clamps are probably absent from bases of the basidia.
On the taxon page for A. russuloides, the reader will find a brief discussion of the problem of the actual number of gemmatoid taxa in eastern North America.—R. E. Tulloss
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The following material is based on original research by R. E. Tulloss.
38 - 62 mm wide, yellowish with darker disc, tacky to viscid, shiny; context white, brownish to somewhat yellowish in disc, 3 - 4 mm thick at stipe, thinning evenly for about 80% of radius, then a membrane; margin striate (0.2 - 0.35R), nonappendiculate; universal veil white, unchanging when cut or bruised, as thin and narrow patches, subfloccose to floccose to floccose-felted, detersile, sometimes absent.
free to narrowly adnate, with or without decurrent line on stipe apex, subcrowded to crowded, pale yellowish white to cream in mass, white in side view, unchanging when cut or bruised, 3 - 5.5 mm broad; lamellulae truncate to rounded truncate, ??.
54 - 87 × 6 mm, white, browning from handling, narrowing upward, flaring at apex, longitudinally striatulate, finely fibrillose below; context white, unchanging when cut or bruised, brownish in larva tunnels, solid or stuffed with white cottony material, with central cylinder 1.5± mm wide; bulb 15 - 19 × 11 - 14 mm, ovoid to ellipsoid; partial veil small, whitish, membranous, submedian or superior (then about one third of stipe length from apex), collapsing on stipe or ephemeral; universal veil in a very narrow thin collar or limbate, if limbate then tip of limb up to 25 mm from bottom of bulb, white.
Odor fungoid to lacking. Taste not recorded.
35 - 59 × 10.0 - 12.5 μm, ??, projecting up to 15.0 μm beyond surrounding basidioles; clamps ??.
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.