Pyxine profallax

The loosely attached grey, whitish, or brownish-grey thallus of Pyxine profallax reaches a diameter of up to 5 cm (2 in). A mat of shiny black rhizines attach the thallus to its bark substrate. The lobes making up the thallus are up to about 1 mm wide, and divide more or less dichotomously. They have pseudocyphellae on the margins and a reticulate upper surface texture. Neither soredia nor isidia occur in this lichen, but it does have ascomata of the obscurens-type, measuring 0.5–1 mm in diameter, with black discs. The ascospores, which number eight per ascus, have a single septum and measure 16–20 by 6.5–8 μm.^[2]

Pyxine profallax contains norstictic acid as a major compound, testacein (submajor), and atranorin as a minor secondary metabolite. Thin-layer chromatography shows that it also contains the same chemical array of terpenes that are found in its namesake, P. fallax.^[2]

Originally described from Papua New Guinea, it was recorded from Thailand in 2012,^[3] and from Queensland, Australia in 2015.^[4]