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This paper deals with the epiphytic algae found in a channel and in an artificial pond in Estación Experimental INTA Delta (Buenos Aires, Argentina). These algae are in relation with a carp population that feeds on them in their early stages. A total of 21 taxa were identified. One was a new taxon, Uronema elongatum Hoodgetts var. robustus L. Mercado et Vigna, and six are new records for Argentina. Among the Cyanophyceae, the 60% were associated algae whereas the rest were epiphytic on emergent macrophytes. The coccoid Xantophyceae were found on filamentous Chlorophyceae, whereas the filaments themselves were epiphytic on emergent macrophytes. [ABSTRACT FROM AUTHOR]

The diatom flora of Paso de las Piedras reservoir and affluents, Buenos Aires Province, was studied. In this paper we present those species and varieties that belong to the families Diatomaceae, Achnathaceae and Eunotiaceae. Each taxon, studied with light and/or scanning electron microscope, is described and ilustrated. The taxonomic information is completed with references about geographic distribution and ecological requirements. Diatoma moniliforme Kützing, a new record for Argentina and South America is included. A brief characterization of the study area and methodology are also given. [ABSTRACT FROM AUTHOR]

Three genera and nineteen species of foliose Physciaceae from Buenos Aires Province are studied. Their common features are summarized and main morphological variability illustrated Generic descriptions are provided. Species are briefly described, commented and illustrated Problems related to the identification of some secondary products, the anatomy and histology of thalli and apothecia, and the vegetative propagules, as well as the corresponding terminology, are discussed The Importance of an adequate methodology for studying the thallus structure is stressed. Keys to genera and species have been published in an earlier paper (Bol. Soc. Argent. Bot. 28: 169-173, 1992). [ABSTRACT FROM AUTHOR]

This paper deals with the taxonomic study of soil algae in the surroundings of Buenos Aires (Argentina). Sixty-five species are studied. They belong to sixteen genera of Cyanophyceae distributed in five families and two Orders, and twenty genera of Chlorophyceae distributed in twelve families and six Orders. Among Cyanophyceae the family Oscillatoriaceae is the best represented with six genera and twenty species; among the Chlorophyceae, the Chlorococcaceae with six genera and eight species. The species Phormidium frigidum, Ph. subtruncatum, Ph. rubriterricola, Ph. papy raceum, Hydrocoleum brebissoni, Anabaena fertilissima, Tolypothrix brevis, Plectonema gracillimum (Cyanophyceae) and Chlamydomonas gloeopara, Bracteococcus minor, B. giganteus, Chlorococcum pinguideum, Chlorella fusca var. fusca, Ch. saccharophila var. saccharophila, Ch. zofingensis, Ch. minutissima and Klebsormidium subtile (Chlorophyceae) are new records for Argentina, and so are the genera Coccomyxa, Klebsormidium and Pleurococcus (Chlorophyceae). They are described and the species illustrated. Keys are given for the identification of the orders, families, genera and species. [ABSTRACT FROM AUTHOR]