The lichen is characterised by its varying areoles, which are thin to moderately thick, flat to slightly convex, and range from bright yellow to whitish in colour, sometimes with a greenish-yellow hue.

The type specimen was collected by the first author from Beares Beach in the Bermagui township (New South Wales), where it was found growing on rock in sandy outcrops.

The proper margin of the apothecia is orange and about 50–75 μm thick, leading to a brownish-orange or yellowish-brown disc that is noticeably raised.

[3] Elixjohnia bermaguiana is predominantly found in coastal environments, where it establishes itself on a diverse range of rocky substrates, including granite, mudstone, and quartzite.

This lichen typically grows in open, sun-exposed settings and is often found cohabiting with species like Sirenophila eos and Xanthoria ligulata.