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Antigens of algae in the genera Tetracystis and Chlorococcum have been studied extensively by immunodiffusion techniques. Some antigens were speeies-, group-, or genus-specific; others were common to both genera. The results largely supported other data from morphology, physiology, and ultrastructure but indicated a probable error in the taxonomic placement of one species. The cross reactivity between genera may be of importance in human, inhalant allergy to algae. [ABSTRACT FROM AUTHOR]

Three strais of Chlorella were examined by serological procedures for cellular antigenic differences. Antibodies produced in rabbits against the 3 different Chlorella strains demonstrated the presence of antigens common to all 3 strains. Adsorbed antiscra identified antigens specific for each strain. [ABSTRACT FROM AUTHOR]