Here we report and document the occurrence of the diatom Gomphonema lacunicola Patrick
et Freese 1961 from the Pâreng Mts of the Carpathian Mountains, Romania. This observation
was made within the framework of a systematic sampling campaign and analyses that
were conducted in the Southern Carpathians, covering 40 mountain lakes for discovering
the cladoceran fauna and diatom flora of this region between 2012 and 2014. G. lacunicola
was found only in one of the 40 lakes, namely in Lake Câlcescu, where it was extremely
rare, but the characteristic feature of the lake promoted the presence of the species.
Lake Câlcescu is a subalpine lake, located 1,934 m a.s.l. This is the first record
of this diatom species in Romania.
