Common to all species in both genera is the thick bark with small cells in the phloem and large cells in the cortex (dilatation; Figs. 14, 15 and 17). Small groups of sieve tubes are embedded in more-or-less distinct and radially arranged parenchyma cells (Fig. 14). The former are often compressed and form tangential rows with dark zones (Figs. 15 and 16). The only species with small groups of sclereids in the cortex is Geranium sanguineum. 5 out of 20 species in both genera contain crystal druses in par-enchymatic cells. The presence of bacteria-like crystals in the xylem and phloem (rhaphides with blunt points) of Geranium divaricatum (Fig. 7) are very special. Dilatations are mainly found as enlarged parenchyma cells in the cortex (Figs. 14, 15 and 17). Ray dilations are indistinct (Fig. 14).
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