kii said:

“The minuscule Mycena Lazulina. Found on the rotting frond of a tree fern in Victoria, Australia. These pin head sized fungi are bioluminescent, but sadly these were a little too old to glow in the dark. They provide a challenge to photograph being so tiny.”

From Fungi of the World on Facebook. Photo by Kate Wagstaff

I like Tiny Blue Lights. I’ve ever seen them in real life, but I do ID them on iNaturalist when other people put up observations. They really are very tiny. This observation gives you an idea (click on the thumbnails beneath the main picture for the close-ups):

https://www.inaturalist.org/observations/286969821

And they are not always very blue. There are over 700 observations for them in Victoria. If you want to look at lots, here they are:

https://www.inaturalist.org/observations?place_id=7830&taxon_id=547435