Lichenostigma rupicolae ( Lichenotheliaceae ), a new lichenicolous species growing on Pertusaria rupicola

The lichenicolous fungus Lichenostigma rupicolae Fdez.-Brime & Nav.-Ros., collected in France, Spain and Turkey, is described as new to science. It is found growing on the surface of the thalli and apothecia of Pertusaria rupicola , where it forms black patches of radiating plurihyphal strands connecting the fertile stromata. An updated key of the species of subgenus Lichenogramma is included.