This mushroom is known from a single collection with very limited annotation. Utilizing the little information that has resulted from a brief investigation, the most applicable existing name seemed to RET to be A. calyptrata var. albescens a poorly known taxon originally described from Saratoga Co., New York, U. S. A. A sporograph comparison of the present entity with that Peck's A. calyptrata var. albescens is provided below:
A sporograph comparison with another pallid, NE U.S. species of sect. Caesareae is provided below.
Sometimes, individual specimens of A. spreta can be very pale to white. A sporograph comparison of the present taxon to A. spreta is provided here.
A preliminary molecular study (unpublished) of the specimen on which this "taxon" is based shows that the specimen is phylogenetically closest to A. murrilliana in a sample of nearly 60 taxa of sect. Caesareae; however, due to the known morphological difference (spore width) and some phylogenetic differences (ca. 8 bp limited to ITS1 or 1.52% of the single nrITS sequence obtained), RET hesitates to place the present collection in A. murrilliana at present.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-QUE01 Tulloss
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.