The floristic survey of Cymbellales order (Bacillariophyceae) from the Parque Estadual das Fontes do Ipiranga (PEFI), São Paulo State, Brazil, is presented based on the analysis of 28 sampling units. Plankton samples were gathered with a plankton net and periphyton samples through collection and removal of diatoms attached to the stems of submerged plants. The samples were oxidized and analyzed under a light and a scanning electron microscope. Six genera and a total of 36 taxa were identified. Morphological characteristics and dimensions of the frustules were provided for all recorded taxa.Among the species identified, the following 13 are new records for the PEFI: Cymbella tropica, C. turgidula var. venezoelana, Encyonema neogracile var. tenuipunctata, E. angustecapitatum, E. cf. brevicapitatum, Placoneis constans var. symmetrica, P. hambergii, P. undulata, Gomphone maparvulum var. exilissimum, G. augur var. turris, G. brasiliense subsp. pacificum, G. laticollum, and G. urugayense.
diatoms; São Paulo; taxonomy
