Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 189. Phalaenopsis Schilleriana. Rootsflattened and adpressed to bark of a tree. Thenotches on two of the roots are a consequence ofinterruption of growth. One-half natural size. Fig. 190. Phalaenopsis Schilleriana. Portionof root in transverse section. I, through theupper side. II, through the under side. Ejc,exodermis; z>, velamen. centimeters long which was grown in a non-translucent tube was quite devoidof chlorophyll, and yet as flat as a portion which was developed in the other hand, thickening of t
Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 189. Phalaenopsis Schilleriana. Rootsflattened and adpressed to bark of a tree. Thenotches on two of the roots are a consequence ofinterruption of growth. One-half natural size. Fig. 190. Phalaenopsis Schilleriana. Portionof root in transverse section. I, through theupper side. II, through the under side. Ejc,exodermis; z>, velamen. centimeters long which was grown in a non-translucent tube was quite devoidof chlorophyll, and yet as flat as a portion which was developed in the other hand, thickening of the walls of the cells, especially of theexodermis, was markedly less^. In many species of Phalaenopsis theleaves die away in the annual dry season, and only the green roots,which are well protected against loss of water, and the vegetative point ofthe shoot persist. Taeniophyllum. This behaviour leads us on to the cases in which the See Part I, p. 246. - The anatomical structure also through transpiration-relationships. I pass over other anatomical difierences. 286 THE
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