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Abstract
The life history of Gigartina stellata has been completed in culture. Starting from carpospores produced by plants in nature, the alga was taken through two generations within a 3-year period. In all cases carpospores gave rise directly to gametophytic plants without intervention of a tetrasporophyte. Male plants with spermatia were absent in culture, and were not noted in the field. A complete apomictic life history is indicated, and since the gametophyte contains κ-carrageenan this phase can be considered haploid.