Composi？？o de algas perifíticas (exceto Bacillariophyceae) em distintos substratos naturais de um ambiente semilótico, planície de inunda？？o do Alto Rio Paraná, Brasil

the purpose of this study was the taxonomy of dominant periphytic algae (except bacillariophyceae) of three natural substrates, eichhornia azurea kunth, nymphaea amazonum mart. & zucc. and oxycaryum cubense (poepp. & kunth) lye in a semi-lotic environment (the pau véio backwater) at the paraná river floodplain. only those taxa with a frequency of occurrence over 75% of all samples were considered, except diatoms. thirty-one taxa were illustrated, measured and identified at species level, a total of 31 taxa were described, distributed in classes: chlorophyceae (3), cryptophyceae (1), cyanobacteria (14 taxa), zygnemaphyceae (7), euglenophyceae (2) and xanthophyceae (4). twenty-three taxa are first taxonomic reports for the upper paraná river floodplain: chamaesiphon investiens skuja, geitleribactron subaequale (geitler) komárek, chroococcus limneticus lemmerm., c. minimus (keissler) lemmerm., c. minor (kütz.) n？geli, aphanothece microscopica n？geli, phormidium molle (kütz.) gomont, leptolyngbya angustissima (west & g.s. west) anagn. & komárek, l. foveolarum (rabenhorst ex gomont) anagn. & komárek and pseudanabaena frigida (fritsch) anagn. (cyanobacteria); characium ensiforme hermann, c. ornithocephalum a. braun and desmodesmus brasiliensis (bohlin) e. hegewald (chlorophyceae); cosmarium abbreviatum racib., c. bireme nordst., c. pseudopyramidatum lundell, c. subadoxum gr？nblad, c. trilobulatum reinsch, gonatozygon pilosum wolle and staurastrum forficulatum lundell (zygnemaphyceae); trachelomonas hispida (perty) stein emend. deflandre (euglenophyceae); cryptomonas tenuis pascher (cryptophyceae) and characiopsis sphagnicola pascher (xanthophyceae).