Stigmidium gyrophorarum (Arnold) D. Hawksw. is a new species of lichenicolous fungi for Ukraine

Data about Stigmidium gyrophorarum (Arnold) D. Hawksw. as a new species of lichenicolous fungi for Ukraine are presented. Growth of this lichenicolous fungus on thallus of Umbilicaria cylindrica (L.) Delise on the horizontal surface of the sandstone. This species is characterized by brown vegetative mycelium, black globose semi-immersed perithecioid ascomata, pale brown ascomatal wall that is composed of 4–6 la­yers of cells, subcylindrical, bitunicate, 8-spored asci and 1-septate ascospores, hyaline at first but becoming olivaceous with age. Each spore has an upper cell larger than the lower cell and contained a few oil drops. The descriptions, illustrations, localities, ecological and distribution data for new species are provided