Príspevok k poznaniu rodu Usnea (Parmeliaceae) na Slovensku IV.

Occurrence of five species of the genus Usnea (U. dasypoga, U. hirta including U. hirta subsp. helvetica, U. intermedia, U. lapponica and U. subfloridana) is reported from 10 localities of central Slovakia (Nízke Tatry Mts, Spiško-gemerský kras Karst, Veporské vrchy Mts). Chemical and morphological properties of particular collections are discussed.