Arthonia radiata Asterisk Lichen

A common mosaic-forming lichen, mostly found on smooth bark in humid woodlands. The thallus is smooth, whitish or pale grey with a thin brown prothallus. The apothecia are almost completely immersed in the thallus and can be simple, but are more often substellate and are not pruinose.

Listed by Alan Orange in Flora of Glamorgan (Wade et al, 1994)