The information on this page was derived from the
provisional description of Yves Lamoureux
The basicially white cap sometimes becomes yellowish
or brownish in the center. It is 30 - 100 mm
wide, rounded conic at first, but finally convex with
an umbo. Its flesh is white. The edge of
the cap is radially grooved for about one-quarter to
one-third of the cap radius. No volva is found
on the cap.
Lamoureux reported that the gills of this species are
whitish or have a salmon tint.
The white, smooth or slightly fibery, ringless stem
of A. albiceps is 60 - 150 × 5 - 15 mm.
The stem is stuffed or hollow, and its flesh is
white. A memberanaous, white, sack-like volva
encloses the stem's base.
Lamoureux reported the odorl of A. albiceps as
indistinct. No information about taste is
The spores of this species measure (8.0-) 8.1 - 11.5
(-13.5) × (7.0-) 7.4 - 9.6 (-12.6) μm, and are subglobose
to broadly ellipsoid (rarely ellipsoid), inamyloid; clamps
are not present at bases of basidia.
Amanita albiceps is presently known only from the
Province of Québec where it occurs with poplars
for the most part.—Y. Lamoureux and R. E. Tulloss
composite of data from all material revised by RET: [20/1/1] (8.0-) 8.1 - 11.5 (-13.5) × (7.0-) 7.4 - 9.6 (-12.6) μm, (L = 9.9 μm; W = 8.7 μm; Q = (1.07-) 1.08 - 1.22 (-1.31); Q = 1.14), colorless, hyaline, smooth, thin-walled, inamyloid, subglobose to broadly ellipsoid, rarely ellipsoid, adaxially flattened, sometimes with "giant" spores present; apiculus sublateral, cylindric; tontents granulate to mono- or multiguttulate with additional small granules; color in deposit probably white.
Lamoureux (2006): Occasional. Primarily with Populus, sometimes at forest edge. July to September.
CANADA: QUÉBEC—Marguerite-D'Youville [formerly Lajemmerais] Regional Co. Mun. - Boucherville, 19.vii.1998 Y. Lamoureux 3225 (CMMF; RET 521-10, nrITS seq'd.).
A duplicate collection of this species (from which DNA was extracted) was generously supplied to RET from the herbarium of the Cercle des Mycologues de Montréal by Raymond Archambault at the suggestion of Yves Lamoureux. RET is very grateful for this gift.
At our present level of knowledge, it appears that the
present species is quite distinct genetically from
other white or whitish North American taxa in
the Vaginatae such as A. homolae, A. populiphila, and
rasitabula. Although a sporograph
comparison of species with subglobose spores is
sometimes not satisfactory for segregating them, a
sporograph comparison of the three just cited taxa
with A. albiceps is provided here:
The specimen examined was not yet fully mature and
bore a few giant spores. Additional material is
necessary in order to evaluate further the size and
shape of mature spores.
The present species has also been called "sp-WI03" in
Translation of (Lamoureux 2006) from French by RET, who is responsible for any errors.—R. E. Tulloss and Y. Lamoureux
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"Lamoureux's White Ringless Amanita"
Spore data for collections provisionally identified as: Amanita albiceps Lamoureux
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.