Silva, S.M.A. da Cabreira, J. da C. Voos, J.G. Lobo, E.A. Species richness of the genera Trachelomonas and Strombomonas (pigmented Euglenophyceae)in a subtropical urban lake in the Porto Alegre Botanical Garden, RS, Brazil Subjects--Topical Terms: TAXONOMIA VEGETALIDENTIFICAÇÃORIO GRANDE DO SUL