Verrucaria halizoa

Verrucaria halizoa is a widespread species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It was formally described as a new species in 1871 by William Allport Leighton. The lichen has a thin, superficial thallus that is pale olive-green to brown in colour; it lacks ridges or punctae. The thallus is somewhat gelatinous, and more or less translucent when moist. It grows in shaded nooks and crannies among seashore rocks, in the mid-littoral zone. The widely distributed species occurs in Asia, Australia, Europe, North America, the subantarctic islands, and Antarctica....read more on Wikipedia.