Abstract
SUMMARYThe characteristics of reproduction in 2 New York populations of Codium fragile were investigated over nearly a 2‐yr period. Reproduction occurred by the exclusive formation of reproductive cells that germinated and developed, asexually. There was no evidence at any time that the reproductive cells fused and thus functioned as gametes.The relative abundance of the reproductive organs on plants in both populations exhibited a marked seasonal variation. New fronds first initiated reproductive organs during July and attained maximum values during the autumn. Formation of new reproductive organs did not occur during the winter and early spring, and those present slowly degenerated so that minimum values occurred during April–May. Reinitiation of reproductive organs on second‐year fronds started in May–June. It is proposed that a minimum temperature between 12 and 15 C is required for the initiation of reproductive organs and that temperatures below this range are inhibitory to their formation.
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