1. Amanita xanthomitra, Shark R. Co. Pk., Monmouth Co., New Jersey, U.S.A.
2. Amanita xanthomitra, Shark R. Co. Pk., Monmouth Co., New Jersey, U.S.A.
3. Amanita xanthomitra, Shark R. Co. Pk., Monmouth Co., New Jersey, U.S.A.
4. Amanita xanthomitra, Shark R. Co. Pk., Monmouth Co., New Jersey, U.S.A.
The following based on original research of RET.
The cap is 32-80 mm wide and has a deep olive center transitioning to yellowish olive and then white at the edge. The cap is bell-shaped to convex and remains unchanged when bruised or cut. The flesh of the cap is white to pale gray. The volval remnants are crumb-like warts which separate easily from the cap and are white at first then become pale gray to black at their highest points.
The pale off-white gills are narrowly attached and close together. The plentiful short gills are squarely cut off, of diverse lengths, and are unevenly distributed.
The mostly hollow stem is 84 - 135 × 5.5 - 12 mm and is white to pale cream with a yellowish tinge, becoming grayish at maturity or with handling. The stem is sometimes decorated with pale gray to brown fibrils in a chevron pattern. The stem narrows upward and flares at the top. The stem’s flesh is white and remains unchanged when cut or bruised. The volva barely covers the stem’s base and is whitish to pale cream. Volval remnants may be present as fragile cracking patches that are gray to dark gray and easily flake off.
Amanita xanthomitra is odorless. Its taste has not been recorded.
The spores measure (7.7-) 8.4 - 12.6 (-13.6) × (7.3-) 8.0 - 12.2 (-13.3) µm and are inamyloid, globose to subglobose. Clamps are probably lacking at bases of basidia.
This species was originally found in the New Jersey Pine Barrens associated with oak and pitch pine. A specimen was also described from Pennsylvania in the loam of a mixed forest containing oak, eastern hemlock, and pine. There is photographic evidence that the species occurs as far north as Quebec. It may be found singly or growing in a small group.—R. E. Tulloss and N. Goldman
Tulloss nom. prov.
"Yellow Headband Ringless Amanita"
ΞΑΝΘΟΣ, "yellow" (Grk.) + μιτρα, "head band" (Grk.); hence "[bearing a] yellow head band"—because of the yellow zone that is a striking character of young specimens
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32 - 80 mm wide, more yellow than 5D5 or more olive than 5C5 and 10YR 6/4 or browner than 2.5YR 6/4 or more saturated than 2.5YR 7/4, with young specimens having a deep olive disc which transitions to yellowish olive then yellow and finally white at the margin, occasionally with very pale margin persisting at maturity, sometimes with thin dark line developing along margin, campanulate at first, unchanging when bruised or cut, becoming convex to planoconvex and somewhat depressed, dull, faintly tacky to somewhat waxy; context white with pale sordid tint at times, faintly to intensely concolorous with pileipellis for 1± mm below same, unchanging when cut or bruised, 2 - 4.5 mm thick at stipe, thinning evenly for one half to three-quarters of radius, then membranous to margin; margin striate (0.3 - 0.45R), nonappendiculate, sometimes developing fine dark radial lines on outer parts of ridges between striations; universal veil as crumb-like warts, white at first, soon becoming pale gray then gray and eventually black (at least on highest points), finely verruculose, detersile.
narrowly adnate without decurrent line on stipe apex or with a tiny decurrent tooth (lens), close, off-white to very pale cream in mass, white to very pale off-white to barely creamy white to slightly watersoaked white in side view, unchanging when cut or bruised, 3 - 8.5 mm broad, at first with white minutely flocculose edge, occasionally anastomosing; lamellulae truncate to subtruncate, unevenly distributed, of diverse lengths, plentiful.
84 - 135 × 5.5 - 12 mm, white to pale cream with yellowish ting, becoming grayish at maturity or handling in some specimens, rather strongly fibrillose in chevron-like pattern, with fibrils white at first, becoming pale grayish to dark gray to gray brown to black at maturity or with handling, narrowing upward, flaring slightly at apex; context white, unchanging when cut or bruised, concolorous in larva tunnels, hollow with some cottony white fibrils, with central cylinder 3 - 7 mm wide; exannulate; universal veil as appressed wavy line or lines (12 - 20 mm up from base of stipe), often with thin appressed cup whitish to pale cream, barely covering stipe base, additionally sometimes a few small scattered cracking detersile patches (sometimes confluent), very fragile (submembranous, friable), pallid at first, becoming dark gray to black.
Odorless. Taste not recorded.
Syringaldazine, spot test for laccase - negative throughout. Paracresol, spot test for tyrosinase - rapidly positive throughout basidiome except negative in base of stipe. Test voucher: Tulloss 8-9-87-A.
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.