Ascomata micromorphology of Pyrenidium actinellum s.l. (Dacampiaceae, Ascomycota)

Unidentified squamulose epilithic lichen infected by lichenicolous fungi was collected on the territory of Uzhanski National Nature Park in 2013. Due to detailed studies of the lichenicolous fungus it appeared to be Pyrenidium actinellum s.l. – species known for Ukraine only from Ternopil oblast. P. actinellum is new for the Eastern Carpathians. The description of ascoma, asci, and ascospores of studied specimen are given