About Hypogymnia tubulosa (Schaer.) Hav.
Hypogymnia tubulosa is a foliose lichen species belonging to the Parmeliaceae family. Ludwig Emanuel Schaerer formally described this taxon in 1840, classifying it as a variety of Parmelia ceratophylla. In 1918, Johan Johnsen Havaas reclassified it as a separate, distinct species. A lichenicolous fungus that grows on Hypogymnia tubulosa, Tremella tubulosae, was formally described as a new species in 2020. This fungus has been recorded in Scotland and Spain, where it infects its host Hypogymnia tubulosa, causing distinct, convex, dark brown to blackish galls to form on the surface of the host lichen's thallus.
