LIFE HISTORIES OF<i>BLIDINGIA MINIMA</i>(CHLOROPHYCEAE), ESPECIALLY SEXUAL REPRODUCTION<sup>1</sup>

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<jats:title>ABSTRACT</jats:title><jats:p><jats:italic>Blidingia minima</jats:italic>(Näg. ex Kütz.) Kylin from Muroran, Hokkaido, Japan, has been shown to exhibit four patterns of life history in culture. Sexual reproduction, reported fully for the first time in the genus, occurs in two of them. I. An isomorphic‐heteromorphic complex in which erect, tubular sporophytes alternate with dioecious gametophytes of the same forms, with the irregular production by both phases of discoid or pulvinate (pincushion‐like) microthalli capable of both sexual and asexual reproduction. II. An alternation of heteromorphic phases in which an erect, tubular sporophyte alternated irregularly with a gametophytic microthallus. III. An asexual alternation of heteromorphic phases in which an erect, tubular frond alternates irregularly with a microthallus by means of quadriflagellate zoospores. IV. An asexual, monophasic life cycle in which erect, tubular fronds are perpetuated by quadriflagellate zoospores. The first pattern occurred in spring populations from one of three sites. The second occurred in populations from two sites. The third and fourth occurred in all populations tested. The life history of<jats:italic>Blidingia minima</jats:italic>from Muroran is similar to that of<jats:italic>Kornmannia zostericola</jats:italic>from Muroran.</jats:p>

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