Last year, I showed spores of a mushroom that I had found in woodchip mulch in a supermarket car park. My identification at that time was a tentative Stropharia aurantiaca.
This week, I found it in the same location and took this shot (cap is 5 cm. diameter):
Since I first identified it last year, I found that it has been renamed as Leratiomyces ceres, or Redlead Roundhead. The orange/red cap with grey/pink gills on a dirty white stipe is very distinctive, and it is clearly expanding its territory rapidly. A native of Australia, it was first reported in Britain in 1957. The first record in Northern Ireland was in 1995, and it has been recorded there regularly since then.
As far as I can ascertain, this is the first Irish record, although I'm sure it won't be the last.