Abstract
Abstract A species of Liagora collected from the Florida Keys, USA, and most closely resembling L. ceranoides Lamouroux (Liagoraceae, Rhodophyta), exhibited a heteromorphic life history in culture. Carpospores released by cystocarps of field-collected female gametophytes gave rise to free-living, uniseriate, filamentous thalli in long days (LD) and short days (SD) at 25°C. These uniseriate plants released monospores continuously in LD and SD, and on one occasion in SD they developed irregularly zonately divided tetrasporangia, the first time that this type of sporangium has been reported for the genus. Monospores developed into filamentous plants which released monospores that repeated this uniseriate phase. Prior to settlement, tetraspores showed amoeboid movement. After settlement, tetraspores germinated into dioecious, multiaxial gametophytes. Carposporophytes began to form on female plants, but carposporangia did not develop. Field-collected gametophytes were dioecious; spermatangia were borne termina...
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