Fissurina pseudostromatica

Fissurina pseudostromatica is a lichen that forms a thin, crust-like growth on bark and belongs to the family Graphidaceae. It was first described from subtropical Florida. It forms pale clusters of very small, immersed lirellae (slit-like fruiting structures) that look like tiny stromata, and standard chemical screening (thin-layer chromatography) did not detect any lichen substances. It has since been reported from Brazil and from Yunnan in southern China.