Astrothelium lucidostromum
Astrothelium lucidostromum is a species of corticolous lichen in the family Trypetheliaceae. Found in Guyana, it was formally described as a new species in 2016 by Dutch lichenologist André Aptroot. The type specimen was collected by Harrie Sipman about south of Aishalton at an altitude of ; there, it was found in a savanna forest growing on smooth tree bark.
The lichen has a smooth and somewhat shiny, pale yellowish-grey thallus with a cortex but lacking a prothallus, which covers areas of up to in diameter. The presence of the lichen does not induce the formation of galls in the host plant. The pseudostromata contains lichexanthone, a lichen product that causes that structure to fluoresce when lit with a long-wavelength UV light.
The main characteristics of the lichen distinguishing it from others in Astrothelium are the UV+ pseudostroma; the fused ascomata; and the immersed pseudostroma that have a white cover. Astrothelium eustomuralis is a similar species, but in that species, lichexanthone only occurs in the ostiole, not the entire pseudostroma.