Abstract
Abstract Culture and morphological studies have shown the red alga Ahnfeltia concinna J. Agardh (Gigartinales, Phyllophoraceae) to have a triphasic life history with conspicuous gametophytes and small crustose tetrasporophytes. The thalli of male and female gametophytes are erect fronds that grow from well developed basal crusts. Male thalli have terminal spermatangia in either a single sorus located at the branch apices or in several band shaped sori near the tips of the branches. The procarps in the female thalli are three-celled carpogonial branches borne on large supporting cells and occur in groups of five to thirty near the apex of the branches. The supporting cell functions as the auxiliary cell and one or several auxiliary cells participate in the formation of the carposporophyte. Carpospore germlings give rise to crustose thalli that are morphologically similar to the basal crusts of the gametophytes. Cruciate tetrasporangia develop from intercalary cells of the erect filaments of the crusts and ...
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