The study aimed at contributing to the diatom biodiversity of the State of São Paulo, southeastern Brazil, particularly to genus Lemnicola. Ninety-six samples were collected, representing 64 municipalities of the state, including plankton and periphyton of lentic and lotic systems. Lemnicola hungarica (Grunow) Round & Basson, the genus single species, was always found associated to submerged substrata. It was registered in three municipalities (Itapura, São Paulo and Reginópolis), indicating the restrict distribution of the genus in the state. Genus is cited for the first time for São Paulo State, and ultrastructure (SEM) information is pioneer for Brazilian specimens.
Achnanthidiaceae; diatoms; taxonomy
