Acanthothecis rimosa

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Acanthothecis rimosa is a bark-dwelling lichen from the Graphidaceae family found in Brazil. It was described as a new species in 2022 by André Aptroot, Robert Lücking, and Marcela Eugenia da Silva Cáceres. The type specimen was collected in Pedra Talhada, a private area in Quebrangulo, Alagoas, at about 500–700 meters above sea level.

The lichen has a smooth, somewhat shiny, mineral-grey body (thallus) that lacks a cortex and a prothallus. The spore-producing sacs (asci) contain two spores each. The spores are clear and ellipsoid, about 45–53 by 13–16 micrometers, with 15–19 transverse and 3–4 longitudinal septa.

Stictic acid is present in Acanthothecis rimosa and can be detected using thin-layer chromatography.