Astrothelium komposchii
Astrothelium komposchii is a species of corticolous lichen in the family Trypetheliaceae. Found in Venezuela, it was formally described as a new species in 2016 by Dutch lichenologist André Aptroot. The type specimen was collected by Josef Hafellner and Harald Komposch about southwest of La Esmeralda at an altitude of ; there, on the west bank of the Surumoni river, it was found growing on the bark of Goupia glabra. The species epithet honours Komposch. The lichen has a green, discontinuous thallus comprising rows of small, flattened with a hyaline cortex. The presence of the lichen does not induce the formation of galls in the host plant. No lichen products were detected in the collected specimens using thin-layer chromatography. The main characteristics of the lichen distinguishing it from others in Astrothelium are the uncoloured hamathecium, and the dimensions of its ascospores.