The cap of Amanita sp-N46 is 68 mm wide, tan without any fulvous tint; the umbonate center is dark fulvous. The flesh of the cap is white, with a very thin brown region below the cap's skin in the center only. The margin of the cap is striate for about one third of the cap's radius. Volval remnants are usually absent from the cap.
The gills of this species are free, crowded, pale orangish cream in mass, and pale cream in side view. The common short gills are truncate, unevenly distributed, and of diverse lengths.
The stem is 134 × 13 mm, pale cream or faintly orangish cream, more orange and more sordid where handled, and exhibits rust to orange-brown staining where stem surface is broken or where surface fibrils of the stem are crushed together. The longitudinally oriented fibrils on the stem are densely placed and more strongly pigmented than ground than the ground color. The stem's flesh is white to off-white, not changing when cut or bruised and hollow. The more or less tubular volva is saccate, white, staining when damaged as the stipe surface does. The volval sack sometimes may easily separate from the base of the stem during collecting.
The odor of this species is reported as indistinct.
The spores of the present species measure (10.5-) 12.0 - 14.0 (-15.5) × (9.6-) 10.8 - 13.5 (-14.5) µm and are globose to subglobose and inamyloid. Clamps are probably absent from bases of basidia.
This species is only known from Middlesex Co., Connecticut. Its distinctive cap coloring should help make it recognizable in the field, if it is found again.—R. E. Tulloss
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Olive text indicates a specimen that has not been
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The following text is derived from original research of R. E. Tulloss.
68 mm wide, tan without fulvous tint (close to 5C5), with disc dark fulvous (as often seen in A. amerifulva), planar, umbonate, tacky; context white, with very minimal brown line under pileipellis in disc only, not changing with cutting or bruising, 5 mm thick above stipe, thinning evenly for three-quarters distance to margin, thence membranous; margin striate (0.35R), not appendiculate, often splitting deeply at maturity; universal veil absent.
free, crowded, pale orangish cream in mass, pale cream in side view, unchanging when cut or bruised, 4 mm broad; lamellulae truncate, unevenly distributed, of diverse lengths, common, with some lamella-lamellula pairs giving appearance of forking because of lamella curving around lamellula.
134 × 13 mm, pale cream or faintly orangish cream, more orange and more sordid where handled, with rust to orange-brown staining where stipipellis is broken or where surface fibrils are crushed together, narrowing upward, slightly flaring at apex, faintly longitudinally striatulate, with longitudinally oriented fibrils densely placed and more strongly pigmented than ground; context white to off-white, not changing when cut or bruised, hollow, with 7 mm wide central cylinder lined with white cottony fibrils; exannulate; universal veil as saccate volva, white, staining when damaged like stipe surface, membranous, subtubular, with dry exterior, lacking the rusty orange staining common in A. amerifulva, ?? × ?? mm, distinct from stipe context and apparently separable from stipe context even below stipe base.
Odor indistinct. Taste not recorded.
bilateral, divergent; wcs = 60 - 65 µm (fresh material); ??; subhymenial base ??; filamentous, undifferentiated hyphae ?? µm wide, ??, with septa markedly constricted both in divergent elements of subhymenial base and in central stratum, with occasional segment reaching from close to central stratum to one cell away from basidial base; inflated cells apparently all intercalary; vascular hyphae ?? µm wide, ??.
wst-near = 110 - 130 µm (fresh material); wst-far = 140 - 145 µm (fresh material); comprising 1 - 3 (-4) cells between subhymenial base and base of longest basidia, having branching structure very apparent despite plenitude of inflated cells, with basidia arising predominantly from globose to subglobose inflated cells and occasionally from cells of other shapes or uninflated or slightly inflated short hyphal segments.
69 - 89 × 16.0 - 21 µm, 4-sterigmate, with sterigmata up to 5.5 × 3.0 µm; clamps ??.
This species differs from Amanita amerifulva in
spore size, the lack of orange tint on the pileus
outside the disc area, broader central stratum of
the lamellae, much broader subhymenial tree, strong
bruising reaction on stipe surface fibrils and on
damage to the volva, and lack of rusty spots
scattered over uninjured portions of the
The following figure provides a sporograph
amerifulva and the present species:
A sporograph comparison of the present species with
sp-N46 will be found on the taxon page for
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.