Taxonomic survey of the Oocystaceae (Chlorophyceae, Chlorococcales) present in the PEFI, Parque Estadual das Fontes do Ipiranga lacustrine systems. Material examined included periphyton and plankton from different aquatic systems within the PEFI, and revision of all material cited for the Parque area and deposited in the Herbário Científico do Estado "Maria Eneyda P. Kauffmann Fidalgo" (SP). Fifteen species were identified, which are distributed in 7 genera (Franceia, Granulocystis, Lagerheimia, Nephrochlamys, Nephrocytium, Oocystis, and Rhombocystis). Citations of Lagerheimia longiseta (Lemmermann) Printz, L. citriformis (Snow) Collins, and Oocystis marssonii Lemmermann are pioneer for the PEFI. Garças Pond was the system presenting the highest species richness (nine taxa) probably due to the greater sampling effort devoted to that system.
biodiversity; floristic survey; phytoplankton