Caloplaca cerina


Caloplaca cerina, also known as the gray-rimmed firedot lichen, is a species of lichen. It is part of the monophyletic Caloplaca cerina species group and is the type species of the genus Caloplaca.

Description

Caloplaca cerina has a crustose thallus, typically dark grey to white. It has a, although this is sometimes thin and difficult to note. However its appearance can be very variable; as a result, many specimens that have been identified as Caloplaca cerina are actually other species. One study that examined 3,000 specimens of Caloplaca cerina found that roughly 1,000 were other species.

Distribution

It is very common on tree bark, particularly on poplar and elm trees.