Data on the habitat characteristics and state of the single permanently observed population of Epipogium aphyllum Sw. in Lithuania is presented. The population is situated in the Aukštaitija National Park (Ignalina district, East Lithuania). The population of Epipogium aphyllum consists of three sub-populations occurring in 100–110 years-old spruce forest with sparse herb vegetation on permanently humid soil. In 1984 a single flowering plant was observed; whereas, in 1997 the number of flowering stems reached 45. The stems were up to 20 cm high, with 1–3, occasionally, with 4 flowers. Flowering period continues from the middle till the end of July. The habitat is in the forest ecosystem conservation zone of the Aukštaitija National Park.
Keywords: Orchidaceae, Epipogium aphyllum, biology, flowering, Aukštaitija National Park, Lithuania.