Haematomma sorediatum

Haematomma sorediatum is a species of corticolous (bark-dwelling) crustose lichen in the family Haematommataceae. It is distinctive among its relatives for producing soredia (powdery asexual reproductive particles containing fungal and algal cells) in small, round soralia; these soredia can disperse and form new lichen bodies (thalli). It forms pale white to greyish crusts on tree bark and has been recorded in Australia and New Zealand, with scattered records in Europe and the Americas. When it produces fruiting bodies, they are bright red and stand out against the pale thallus. The species was formally described in 1982 from south-eastern Australia. Records now extend across Australasia and to scattered localities elsewhere, but it remains poorly documented in many regions....read more on Wikipedia.