Calicium victorianum

Calicium victorianum is a lichen-forming fungus in the family Caliciaceae. This tiny lichen is almost invisible to the naked eye, living inside weathered wood and producing minute, bell-shaped fruiting bodies that look like dark specks on the surface. Originally discovered in Australia in 1889 growing on Eucalyptus fence posts, it specialises in colonising hard, sun-exposed wood that has been naturally weathered. The species has an unusual distribution, being found in Australia, New Zealand, and also at a single site in southern England, making it one of the few lichens with such a widely scattered range between the Southern and Northern Hemispheres....read more on Wikipedia.