Photo and caption by Mark Barton
These are the fruiting bodies of Pinhead Slime Molds. They are neither plant, fungus nor animal. They are colonies of single celled organisms which behave much like a fungus. They can be very difficult to find but are visible with the naked eye. These were growing on the underside of a rotting Oak leaf. I photographed them with a hypermacro lens in natural light, the yellow of the Oak leaf added warmth to the scene. For scale, each "pinhead" is about a single millimeter tall.
Location: Leigh Woods, Bristol, UK