The author studied the microflora from two genera of Bromeliaceae: Hoenbergia and Portea. The material was collected in six natural regions of Pernambuco State: 1) Humid Forest Region; 2) Dry forest region; 3) Central Agreste Region; 4) Setentrional Agreste Region; 5) Meridional Agreste Region; 6) Recife Region. The following diatoms that indicate polluted water (oligosaprobic species) have been found in the six Regions studied: Gomphonema parvulum (Kutz) Grunow, Hantzschia amphioxys Grunow, Pinnularia borealis Ehr., Pinnularia microstauron (Ehr) Cleve, Gomphonema gracile Ehr., Nitzschia palea Kutz., Melosira roeseana Rabenh., Navicula mutica Kutz., Navicula cryptocephala Kutz., Eunotia pectinalis (Kutz) Rabenh. Chlorophyceae were also found in samples collected in rainy and dry seasons. some are indicators of oligosaprobic conditions: Sceneaesmus quadricauda (Turpin) Brebisson, Chloro coccum sp., Chlorella sp. Ecological factors and comments, concerning diatoms are reported in the text. Most part of diatoms we have reported in the Agreste Regions. Table (I) shows the frequency of diatoms in the six Regions studied. Table (II) indicates temperature and pH of the water of the bromeliads Hoenbergia and Portea in both seasons of the year (winter and summer). We report the occurence of Culex larvae in Portea and Hoenbergia, however, we also found Anopheles larvae, but they were rarely observed. Collections were made in the rainy and dry seasons in Hoenbergia and Portea. A total of 35 species was determined from 78 samples collected during a period of 26 months.