Myriospora signyensis

Myriospora signyensis is a crustose lichen in the family Acarosporaceae, known only from Signy Island (South Orkney Islands, Antarctica). It is characterised by a thallus that becomes distinctly lobed and often orange-red or rust-coloured at the margins, and by large, sessile apothecia with a prominent, raised rim. Molecular phylogenetics analyses place it as a well-supported sister to Myriospora scabrida, although it never attains the green-tinged colouration of that species and instead lacks the thick pigmented epinecral layer common in M. scabrida....read more on Wikipedia.