Slime Mould Arcyria obvelata
I found this colony today on detached willow bark.
This shows the expanded capitillium (fine mesh) tipped by an unusually complete cap. The FOV was about 7mm wide.
I have varied the brightness in the images. The second stereo shows the colour visible to the naked eye.
Olympus EM-1 (manual mode), Laowa 25mm f2.8 2.5x-5x ultra-macro at x2.5 f11, twin TTL flash hand-held.
The stereos are crosseye.