A cup Fungus -- Bisporella citrinaIs

Commonly called "yellow fairy cups" or "lemon discos"

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This shows
the mushroom (?) at
one hundred times magnification

Note: I could not
get the magnified image in color
see below for an image in color at 40x

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This shows
the mushroom (?)
as it was growing

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At a magnification of 1000x
one can see structures
that look like ASCI
The outside width of these tubes is about three microns

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This shows
the mushroom (?) on
the log at
about a 40x magnification

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Sorry for the poor picture
but if you look closely, you can see what appears to be a veil
partially broken with a deeper yellow layer beneath

Click on a thumbnail below to enlarge that particular image