Australasian Lichenology 58: 20 (2006); type: Australia, Northern Territory, Tabletop Range, Lichfield National Park, 31°11'S, 130°50'E, 2. Jun. 1991, J. A. Elix 27513, H. T. Lumbsch & H. Streimann (CANB—holotypus).

Thallus crustose, leprose, with powdery appearance; greenish grey to greyish green or cream to greyish white; relatively thin to very thin, up to 250 µm, relatively soft, not very firmly attached to the substrate; shape irregular or rosettes that later fuse with each-other, rosettes 0.5-2 cm, irregular patches to 10 cm in diam.; margin delimited to diffuse, lobes absent or present, sometimes well defined, up to 1 mm wide and with raised margin; cortex absent; true medulla absent but hypothallus may look like medulla; hypothallus sometimes present, thin, lax, white; areoles absent; squamules absent; thallus surfaces without soredia present, hypothallus exposed in places, soredia abundant to sparse in places, very fine, 15-40 µm in diam., relatively densely packed; projecting hyphae present, variable, sometimes very long along margins (up to 600 µm), shorter in centre (20-125 µm); consoredia common to scarce, 150-200 µm; soredia well separated from each other; isidia-like structures absent. Photobiont chlorococcoid, cells 7-12 µm in diam.