Ecological trends in the phloem and the pith

Characteristic of the cortex of annual shoots of Nymphoides pel- The net-like construction of the cortex and the pith, the thin-

tata are isolated, thick-walled, lignified idioblasts with star-like, walled epidermis and the missing phellem seems to be an adop-

pointed protuberances (Figs. 10 and 11). The epidermis is thin- tion to the submerse environment. walled (Fig. 12).

Fig. 8. Sieve area-like perforations in parenchyma cells of the cortex. Rhizome of plant in a pond, mountain zone, Alps, Switzerland. Menyanthes trifoliata, radial section.

Fig. 9. Phellem and leaf basis at a node of rhizome with cortical inter-cellular spaces. Rhizome of plant in a pond, mountain zone, Alps, Switzerland. Menyanthes trifo-liata, radial section.

Fig. 8. Sieve area-like perforations in parenchyma cells of the cortex. Rhizome of plant in a pond, mountain zone, Alps, Switzerland. Menyanthes trifoliata, radial section.

Fig. 9. Phellem and leaf basis at a node of rhizome with cortical inter-cellular spaces. Rhizome of plant in a pond, mountain zone, Alps, Switzerland. Menyanthes trifo-liata, radial section.

Fig. 10. Thick-walled lignified idioblasts with star-like, pointed protuberances. Annual shoot of plant in a pond, hill zone, Botanical Garden Zürich, Switzerland. Nymphoides peltata, tangential section.

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