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The spatial arrangement of tubules building up the prolamellar bodies of proplastids in etiolated bean leaves was investigated by electron microscopy. The basic unit of this arrangement is the tetrahedron *, joining to uniplanar five-membered rings with slightly distorted angles and sixmembered strainless rings designated “chair-form” and “boat-form” (following the nomenclature of the two stereoisomeres of cyclohexane in organic chemistry). The center of the concentric prolamellar bodies is held by a pentagonal dodecahedron. This pentagonal dodecahedron and its environment in the direction of the 6 pentagonal axes are built up by five-membered rings combinated with the six-membered boat-form. The chair-form fills up the intermediate spaces and increases in number removing off the center. As the central pentagonal dodecahedron has six fivefold, ten threefold, and fifteen twofold axes, ultrathin sections of the concentric prolamellar bodies show corresponding 532-symmetry provided that the cutting plane meets one of these axes at right angle.

zeitschrift für naturforschung b

Zur Kristallgitterstruktur der sogenannten Prolamellarkörper in Proplastiden etiolierter Bohnen: I. Pentagondodekaeder als Mittelpunkt konzentrischer Prolamellarkörper