Abstract
Hildenbrandia rivularis was collected in Denmark and the United States. The life history of this encrusting red alga is described on the basis of unialgal cultures maintained for more than 2 years. Significant changes in cellular and colonial morphology are reported. Events of the life history (i.e., reproduction by stolons, fragmentation, or gemmae; and manner of branching) which were previously in question or unknown are clarified. Mechanism(s) of certain morphogenetic phenomena remain obscure (cell wall and plastid ontogeny). These and related problems are now under investigation. Hildenbrandia should be added to the freshwater algal flora of the United States.
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