Abstract
Chloroplasts in reproductive blades of the marine red alga Constaninea subulifera contained crystalline aggregations of phytoferritin. The native electron density of the particles' iron component was demonstrated in unstained sections, sections deosmified with periodic acid, and specimens prepared without osmium postfixation. Year-old reproductive blades of C. simplex contained phytoferritin, but phytoferritin was not present in young growing blades of the same thallus. These findings indicate that phytoferritin is produced as part of the senescence process of the annually replaced blades.
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