SUMMARYFive monosporangiate species ofRozella, R. laevisinPythiumsp.,R. CladochytriiinCladochytrim replicatimi, R. RhizophlyctiiinRhizophlyctis roseaandRhizophlyctissp.,R. EndochytriiinEndochytrium operculatum, andR. RhizophydiiinRhizophydium globosum, were found in Brazil.Rozella Rhizophydiihas fairly large zoöspores and is limited in host range toRhizophydium globosum.It is accordingly diagnosed as a new species, although its life cycle is not completely known. In addition to these monosporangiate parasites, one polysporangiate species,R. Achlyae, was found in the sporangia ofAchlya flagellata.