Markus Hauck

Graphis tetralocularis is a species of crustose lichen in the family Graphidaceae. Found in Rwanda, it was formally described as a new species in 2005 by Christina Bock and Markus Hauck. The type specimen was collected by the first author from Akagera National Park at an altitude of 1,369 m (4,491 ft); here it was found growing on a twig of a Nuxia floribunda tree. It is only known to occur at the type locality, which is a dry forest dominated by the trees Nuxia floribunda, Haplocoelum gallense, and Strychnos usambarensis. The lichen has a thin, smooth, whitish grey to grey-green crustose

Bacidina adastra is a species of corticolous (bark-dwelling) leprose lichen in the family Ramalinaceae. The lichen has a distinctive thick, powdery, bright yellowish-green thallus, forming patches up to half a metre in diameter. First described in 2003 from the Netherlands, it has since been documented throughout Western and Eastern Europe in countries including Belgium, England, Germany, Poland, Russia, and Sweden. The lichen primarily grows on tree bark, especially on nutrient-enriched bases of trees like poplar, willow, and elm, though it can occasionally be found on wood, soil, and rock.

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Ramboldia gowardiana is a species of corticolous (bark-dwelling), crustose lichen in the family Ramboldiaceae. First discovered in 2003 in Montana, United States, it typically appears as a grayish or greenish crust on tree bark, particularly on conifers like pines and firs. The lichen is characterised by its small, bright red to orange-red reproductive structures (apothecia) visible on its surface. R. gowardiana is found in dry, temperate forests from Alaska to California, often at elevations between 300 and 1,400 meters (about 980 to 4,600 feet). Initially classified in a different genus, it