The ultrastructure of apical cells of six species of Sphacelaria (S. arctica, S. cirrosa, S. nana, S. racemosa, S. radicans, and S. rigidula) is studied here. In most details such as ultrastructure of chloroplasts, mitochondria, microbodies, nuclei and centrioles all Sphacelaria species studied are similar. Only in sections of S. rigidula, however, do pyrenoid-like structures occur.

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Journal Blumea: Biodiversity, Evolution and Biogeography of Plants
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Prud’homme van Reine, W.F, & Star, W. (1981). Transmission electron microscopy of apical cells of Sphacelaria spp. (Sphacelariales, Phaeophyceae). Blumea: Biodiversity, Evolution and Biogeography of Plants, 27(2), 523–546.