Brigantiaea leucoxantha (Spreng.) R. Sant. & Hafelln.
Brazil, Paraná, 3-5 m, leg. Hatschbach & Nicolack 54399 [B].
On not too shady tree bark. The species reminds of Caloplaca, but the apothecia are unusually large and the thallus is more conspicuous, whitish. The apothecium discs are often yellowish -pruinose.
[picture height = 3.5 mm]