ABSTRACT Knowledge of algal and cyanobacterial diversity of phytotelmata remains poorly-known, especially for bromeliads from different vegetation formations. We investigated the microalgae communities of four species of tank bromeliads from different vegetation formations in Bahia State, Northeast Brazil, highlighting the composition, richness and diversity of taxa. Sampling of water stored in bromeliads was carried out quarterly between 2014 and 2016, and abiotic variables and morphometric attributes of bromeliads were measured. A total of 89 taxa of algae and cyanobacteria were recorded for the four bromeliad species studied. The microalgae communities of the phytotelmata varied among vegetation formations, with one tank bromeliad, Alcantarea nahoumii, with more complex architecture (higher number of leaves and thus more cavities), being distinguished by its high species richness (73 taxa). The bromeliads exhibited little similarity in species composition, with only one species (Phacus polytrophos) occurring in all four species. Throughout the entire sampling period, classes with higher species richness, especially due to A. nahoumii, were Zygnematophyceae, Cyanophyceae and Chlorophyceae, which accounted for about 80 % of all species inventoried. Our results contribute to the knowledge of microalga communities of bromeliad phytotelmata in Brazil with regard to species richness and composition, as well as significant environmental characteristics.

Levantamento florístico dos gêneros Octacanthium, Staurastrum e Staurodesmus, da ordem Desmidiales (Zygnemaphyceae) na Reserva Biológica do Parque Estadual das Fontes do Ipiranga situado na cidade de São Paulo, Estado de São Paulo, Brasil. Dezenove espécies de Staurastrum, seis variedades que não são as típicas de suas respectivas espécies e quatro formas igualmente não típicas de suas respectivas variedades; 10 espécies de Staurodesmus, três variedades não típicas e duas formas taxonómicas também não típicas; e duas espécies de Octacanthium foram identificadas, totalizando 45 táxons. Staurastrum tetracerum (Kützing) Ralfs ex Ralfs var. tetracerum f. tetracerum foi a espécie melhor representada do ponto de vista de sua distribuição geográfica, pois ocorreu em cinco localidades no Parque.

Floristic survey of genera Octacanthium, Staurastrum, and Staurodesmus of order Desmidiales (Zygnemaphyceae) in the Parque Estadual das Fontes do Ipiranga Biological Reserve, city of São Paulo, São Paulo State, southern Brazil. Nineteen species of Staurastrum, six varieties that are not the typical of their respective species, and four taxonomic formae also not the typical of their respective varieties; 10 species of Staurodesmus, three varieties not typical and two taxonomic forma also not typical; and two species of Octacanthium were identified totaling 45 taxa. Staurastrum tetracerum (Kützing) Ralfs ex Ralfs var. tetracerum f. tetracerum is the best represented species geographically, occurring in five localities.