Abstract
The rhizome ofPosidonia oceanica shows an arrangement of vascular tissue not yet observed in other plants: a series of vascular cylinders all laid out in a single plane. There is a central cylinder, an atactostele, and six lateral cylinders, three on each side. These lateral cylinders are quite unusual too, each of them being formed by a single perixylematic bundle. For these structures the authors suggest the term haploendoleptostele; the whole arrangement might be called xestomeristele.
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Albergoni, F.G., Basso, B. & Tedesco, G. Considérations sur l'Anatomie dePosidonia oceanica (Zosteraceae). Pl Syst Evol 130, 191–201 (1978). https://doi.org/10.1007/BF00982803
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DOI: https://doi.org/10.1007/BF00982803