SUMMARY Antigens of algae in the genera Tetracystis and Chlorococcum have been studied extensively by immunodiffusion techniques. Some antigens were species‐, 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.
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Brown et al. (1965) studied this question.
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