Categories DavidBlue roundheads Stropharia caerulea Post author By David Post date 7 November 2021 Blue roundhead (Stropharia caerulea) mushrooms. These are from the same small grouping, growing in long grass on tow different days. On one of the days, the lighting conditions gave the blue tinge to the fungi a more marked effect. ← Oak leaves, browning from the tip → Fly agarics, warts washed away