Chaenotheca cinerea

Chaenotheca cinerea is a species of pin lichen in the family Coniocybaceae. This small lichen forms grey-white crusts on tree bark and produces distinctive microscopic fruiting bodies that resemble tiny pins, each standing only 0.6–1 mm tall with thread-thin stalks topped by dark spore-bearing heads. Originally described in 1800 from specimens found in oak bark crevices, it is characterised by its two-toned stalks that are pale at the base and dark at the top, covered with a thick white powdery coating....read more on Wikipedia.