Observation 94468: Agaricus rotalis K.R. Peterson, Desjardin & Hemmes
When: 2012-05-11
Who: tstyles
No herbarium specimen

Notes: These were found in quite damp conditions, growing under pine trees, out of direct sunlight. The spore print was brown, and the stems yellowed overnight. Apparently, Agaricus Rotalis is rare in Australia, and so far has only been reported in Western Australia, this could be the first documented in Vic.

Proposed Names

45% (2)
Used references: Descriptive notes on Agaricus rotalis from Western
Cap: up to 70mm diameter; convex, finally flat. Margin
incurved and fused to a thick veil in the button, later with a
membranous white flap, and finally deeply split radially.
Surface dry, very dark grey to almost black in young
buttons, then paler and covered with minute appressed
dark scales. Remaining black and contiguous at the cap
centre. Then the surface splits radially from near centre to
the margin with striking alternative radial strips of
blackish-grey with minute scales, and white where the
underlying white context is exposed. Veil: white,
membranous, thick, forming a superior, pendulous but
collapsing ring that becomes ragged and torn with age and
may disappear entirely in some specimens. Gills: free, to
7mm deep, cream in button, then pale pink, dull pink,
finally chocolate, crowded; edge smooth entire and
concolorous; lamellules abundant. Stem: up to 80 × 8mm,
cylindrical or slightly broadening towards base; with an
abruptly swollen base to 15mm broad; solid then
developing a narrow hollow in part. Surface dry, smooth,
shiny white below the annulus dulling especially near the
apex with age; pinkish when young above annulus. Flesh:
white and up to 5mm thick in pileus, unchanging except
rapidly becoming bright yellow when cut at and near the
base. Yellow stain fades after several minutes.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2012-05-11 19:23:32 PDT (-0700)
Last modified: 2012-05-12 04:02:36 PDT (-0700)
Viewed: 156 times, last viewed: 2016-10-25 19:02:17 PDT (-0700)
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