Phaeographis xanthonica

Phaeographis xanthonica is a species of corticolous (bark-dwelling), crustose lichen in the family Graphidaceae.^[2] Found in Brazil, it was formally described as a new species in 2009 by Klaus Kalb and M. Matthes-Leicht. The species epithet refers to the presence of the xanthone substance lichexanthone. The type specimen was collected in Itatiaia (Serra da Mantiqueira, Rio de Janeiro) at an altitude of 1,750 m (5,740 ft). It has also been recorded from Costa Rica.^[1]

Phaeographis xanthonica
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Graphidales
Family:	Graphidaceae
Genus:	Phaeographis
Species:	P. xanthonica
Binomial name
Phaeographis xanthonica Kalb & Matthes-Leicht (2009)
Holotype site: Itatiaia, Brazil[1]

The thallus of Phaeographis xanthonica is smooth, matt, whitish-grey to whitish-beige, and lacks a prothallus. Its ascomata are lirelline in form, curved with tapered ends, and measure 0.5–4 mm long. The discs are black and bordered by a somewhat thick and split thalline margin. The ascospores have a transverse septum that divides it into four cells; their dimensions fall into the range 11–21 by 5–7 μm.^[1]