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Two curious characters of this species are (1) that
there is an upsidedown cone of tissue under the
stem's base and inside the volval sack (2) that the
internal limb of the volval sac can be carried up
with volval by the cap as the mushroom expands.
In the latter case, at least for awhile, the internal
limb may project under the cap and cover the inner ends
of the gills. (See image no. 2, above.)
The reader may wish to compare this species with
the genetically distinct
A. sp-C25.—R. E. Tulloss
Tulloss and S. D. Russell
"Stem-in-a-Cone Ringless Amanita"
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There are at least two striking things in the images of
this species: The limbus internus of the volva appears
to be carried up by the expanding cap; and, at the stage
of development that is depicted, the limbus internus is
still wrapped around the cap edge and projects over the
lamellae. There is an obconic lump of tissue below the
stipe that is neither stipe nor universal
A distinct species with a similar stipe base is
included in these page under the name
The preface (5' motif) the nrLSU gene is of the from
dominant in section
Previously, this organism was called
"A. sp-C27" on this site.
—R. E. Tulloss
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