The article presents the spread of the liverwort <em>Tetralophozia setiformis</em> in the Polish Tatra Mts (Western Carpathians). In the years 1814-1957 only four localities of this plant have been found in High Tatra Mts. Since the 90-ties, an increase in recording of <em>T. setiformis</em> has been noticed, including the first locality in Western Tatra Mts. Currently, there are 17 localities of <em>T. setiformis</em> in the Polish Tatra Mts. In many of them, the plant occurs abundantly; it also remains in the places of its first records. The species has a narrow ecological scale. It is attached to rock blocks, mostly of north exposition. It creates small, single-species turfs plaited in mossy pillows of alpine grasslands of Oreochloo distichae-Juncetum trifidi racomitrietosum lanuginosi hung among rocks.