Orcularia

Orcularia is a genus of four species of crustose lichens in the family Caliciaceae. The genus was originally described as part of another lichen group in 1902 by the Swedish botanist Gustaf Malme, but was elevated to its own genus in 2011 when researchers determined it had sufficiently unique characteristics. These lichens are distinguished by their unusual spore development, where the side walls thicken before the dividing wall forms, creating distinctive bone-shaped immature spores found nowhere else in their family. The four species grow as thin, often barely visible crusts on tree bark in humid coastal and mountain environments, producing small black fruiting bodies and thread-like reproductive structures. ...read more on Wikipedia.