-(Closterium Nitzsch ex Ralfs (Desmidiaceae) in an urban artificial lake, Paraná State, Brazil). An investigation of the genera Closterium from an artificial lake of Cascavel city, Paraná, Brazil was undertaken. The samples were collected from January/2002 to November/2003, in the lake littoral zone. Seventeen taxa of the genera Closterium were identified, where 13 of them were typical and four of them non-typical varieties. C. cynthia De Notaris var. cynthia, represented 25% of total samples, followed by C. moniliferum (Bory) Ehrenberg ex Ralfs var. moniliferum (17%). Taxa
Trata-se do inventário florístico de Scenedesmaceae no Lago Municipal de Cascavel (24°82'S, 53º28´W), Paraná, Brasil. As amostras foram coletadas na região litorânea, no período de janeiro de 2002 a outubro de 2003. Foram registrados 21 táxons, sendo 13 do gênero Desmodesmus e oito pertencentes ao gênero Scenedesmus. O trabalho apresenta descrição, chave e ilustrações para a identificação das espécies.
-(The genus Micrasterias Agardh ex Ralfs (Desmidiaceae, Zygnemaphyceae) in an urban artifi cial lake, Paraná State, Brazil). This study aimed to identify the species belonging to the genus Micrasterias from "Lago Municipal de Cascavel" and contributes to the knowledge of its taxonomic composition and geographic distribution in Paraná State.
Th is work is part of a survey of the desmid fl ora in a tributary of the Itaipu Reservoir, in the state of Paraná, Brazil. Th e objective was to expand the knowledge base regarding the genus Cosmarium (Desmidiaceae, Zygnematophyceae). We conducted a qualitative analysis of 60 samples of phytoplankton, which were collected from along the banks of the São Francisco Falso River between July of 2003 and June of 2004. We identifi ed, drew, and described 18 taxa of Cosmarium. Of those 18 taxa, 8 represent new records for the state of Paraná: C. angulosum Bréb. var. angulosum, C. bireme Nordst. var. bireme, C. clepsydra Nordst. var. clepsydra, C. cf. galeritum Nordst. var. borgei, C. ginzbergeri, C. norimbergense Reinsch var. norimbergense, C. protractum (Nägeli) De Bary var. protractum, and C. rectangulare var. hexagonum (Elfving) G.S. West & West.
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