Jack-o'-lantern mushroom, seta de olivo

Description:

The jack-o'-lantern mushroom's fruiting body (its stem and cap) is an orange color. Its bioluminescence, a blue-green color, is only observable in low light conditions when the eye becomes dark-adapted. The whole mushroom doesn't glow — only the gills do so. This is due to an enzyme, called luciferase, acting upon a compound called luciferin, leading to the emission of light much as fireflies do when glowing.

Habitat:

Mediterranean forest, growing on wild olive tree stumps. Parque Nacional de Monfragüe

Notes:

Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/11; ISO Speed Rating: 200. Focal Length: 90.0 mm.