Two new species of the genus Ochroconis, O. lascauxensis and O. anomala isolated from black stains in Lascaux Cave, France

In the year 2001, some conspicuous black stains appeared on the walls of Lascaux Cave in France, which progressively disseminated throughout the cave. These black stains were so evident by 2007 that they have become one of the cave’s major problems. In a mycological study of the black stains, Ochroconis strains were abundant among the isolates and constituted the major group of melanised fungi. Two new species of the genus Ochroconis, O. lascauxensis and O. anomala, were isolated and described. The description is based on the morphology of the fungi and the phylogenetic relationships of two of its gene regions internal transcribed spacer (ITS) and RNA polymerase II subunit B (RPB2). In addition, data on their physiology and cellular fatty acid profiles are reported. The development of these species was likely linked to the presence of unusual carbon and nitrogen organic sources provided by the intensive biocide treatments.

► Two new species of the genus Ochroconis, O. lascauxensis and O. anomala are described.
► They were isolated from black stains on the walls of the Lascaux Cave, France.
► The descriptions are based on the morphology and ITS and RPB2 gene regions.
► In addition, data on their physiology and cellular fatty acids profiles are reported.
► The presence of these species was likely linked to an intensive biocide treatment.