Macroalgas em nascentes e arredores de riachos na regi？o noroeste do estado de S？o Paulo

macroalgae are typically benthic organisms that a mature, discreet and recognizable naked eye thallus, and microscopic identification is necessary. several studies have been carried out aiming to the taxonomic knowledge in brazilian streams, however works dealing with algae from springs are rare. monthly sampling were carried out from february to september/2007 in springs and the surrounding (humid soil near the springs) of four streams in the northwestern region of s？o paulo state. the floristic survey resulted in the identification of 13 species, being 54% of taxa belong cyanophyta and 46% to chlorophyta. cylindrospermum gorakhpurense, mougeotia gotlandica, spirogyra gallica and s. taftiana were recorded for the first time to brazil. the aquatic flora differed from the regional records due to presence of organisms of zygnemataceae family (chlorophyta) in reproductive stage. this type of habitat revealed to be very favorable to the zygnemataceae reproduction.