MORPHOLOGY AND NUTRITION OF PANDORINA UNICOCCA SP. NOV.1,2

Eleven strains of Pandorina unicocca sp. nov. were studied for morphological characterization. The species was delimited by having cells which contain a single basal pyrenoid and by colonies which have cells separate from each other in the colonial envelope. A defined medium was developed for 4 strains of P. unicocca and the nutritional requirements of these strains were examined. All 4 strains were capable of completely autotrophic growth and they could utilize nitrate, ammonium, or urea as nitrogen sources. Optimum growth was nuts attained at pH 8.0.