Australas. Lichenol. 67: 3 (2010).
Protolog: Sicut Heterodermia hypocaesia sed acidum salazinicum deficiens differt.
Protolog type data: Type: Australia. Victoria: Morwell National Park, Fosters Gully Nature Walk, 16 km S of Morwell, 38°21'24"S, 146°23'27"E, 230 m, on base of tree in wet Eucalyptus forest with Pomaderris understorey, J. A. Elix 39336, 12.iv.2008 (holotype - MEL; isotype - CANB).
Type locality: Australia, Victoria, Morwell National Park, Fosters Gully Nature Walk, 16 km S of Morwell, on base of tree in wet Eucalyptus forest with Pomaderris understorey, 230 m, 12 April 2008, J. A. Elix 39336 (MEL - holotype; CANB - isotype).
Type locality coordinates: 38°21'24"S, 146°23'27"E.
Thallus: foliose, orbicular to irregularly spreading, loosely adnate, to 5 cm wide but often coalescing to form colonies up to 15 cm wide. Lobes 0.5-1.2 mm wide but + widening to c. 2-3(-5) mm wide at the tips, flat to weakly convex or weakly concave, sublinear-elongate, dichotomously branched, radiating, the lobe-tips ascending, usually discrete, + lobulate along the lobe margins, lobules + rotund or sparingly branched, 0.3-0.8 mm wide, eciliate or with very sparse cilia, cilia pale or + blackened at the tips, 0.5-1.0 mm long; lobules along the margin developing small soralia. Upper surface greenish white, whitish to cream-coloured, sorediate; soredia farinose to granular, in labriform to capitate soralia, on lateral or terminal lobes, sometimes spreading along lobe margins. Medulla white. Lower surface ecorticae, arachnoid, purple-black in the centre, white, ochraceus or yellow towards the apices, rhizinate; rhizines marginal, simple, black, 1-3(-7) mm long. Apothecia very rare, laminal, substipitate, 1-8 mm wide; thalline exciple persistent, concolorous with the thallus, lacinulate; disc concave, dark brown to blackish brown, + thinly grey-pruinose. Asci cylindrical to subclavate, 8-spored. Ascospores Pachysporaria-type, ellipsoid, sporoblastidia present, 40-45 x 20-23 µm. Pycnidia common, initially immersed, becoming emergent, visible as black dots; pycnoconidia bacilliform, 4-5 x 1 µm (Elix 2010: 3).
Photobiont: Data lacking.
Chemistry: Cortex and medulla K+ yellow; containing atranorin (major), zeorin (major), 6alpha-acetoxyhopane-16ß,22-diol (major), hybocarpone (major or minor), norhybocarpone (minor or trace), dissectic acid (trace), +7-chloroemodin (trace), hopane-6alpha,16ß,22-triol (trace), + 16ß-acetohopane-6alpha,22-diol (trace), unknown triterpene (trace) (Elix 2010: 3).
Ecology: On bark, dead wood and rock in coastal and hinterland forests (Elix 2010: 3).
Distribution type: Australia and New Zealand.
Taxonomy: Data lacking.
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