Plate 5 from Rex Filson's The Lichens and Mosses of Mac.Roberston Land.

Figures (a) to (c) show Buellia frigida. Leftmost is a typical specimen from Mawson and the other two figures show closer views of apothecia. Figure (d) shows the black apothecia of Buellia foecunda and a fragment of orange Caloplaca.