. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guillierrnond - Atkinson 164 Cytoplasm are often associated or combined with tannins and perhaps with mucilages. Lloyd and various other authors have shown that tannin is often combined with mucilages in the state of a com- plex, and it is thought that the vacuoles containing raphides en- close mucilages. Furthermore, recent work has shown that in certain cells the vacuoles contain a colloidal solution of phytosterol or of phosphoaminolipides. These substances may become par- tially solid in the epidermal cells of the Lili
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guillierrnond - Atkinson 164 Cytoplasm are often associated or combined with tannins and perhaps with mucilages. Lloyd and various other authors have shown that tannin is often combined with mucilages in the state of a com- plex, and it is thought that the vacuoles containing raphides en- close mucilages. Furthermore, recent work has shown that in certain cells the vacuoles contain a colloidal solution of phytosterol or of phosphoaminolipides. These substances may become par- tially solid in the epidermal cells of the Liliaceae (Fig. 112). These cells ordinarily contain a large inclusion, formed of a complex of phytosterol and of phosphoaminolipides, which Mirande described for the first time under the name of sterinoplast. This, he considered. Fig, 109. — Rose. Cells from a tooth of a leaflet under the ultramicroscope, showing faintly luminous contours of the vacu- oles (V) and of the nuclei (N). 1, tip of tooth. 2-4, differentiated cells. to be a cytoplasmic inclusion, a sort of plastid, elaborating phy- tosterol. The work of Miraton and of Emberger has demon- strated that the sterinoplasts are not simple vacuolar concretions. The recent work of Reilhes has established the fact that the vacu- olar sap of these cells contains a solution of phosphoaminolipides and of phytosterol which, in mature cells, becomes partially solidi- fied in the vacuoles in the form of large bodies composed of a phos- phoaminolipide-phytosterol complex. Inclusions, apparently of the same nature, have been cited in the vacuoles by other authors: in the epidermis of Iris, especially, in which they absorb anthocyanin, when the vacuoles contain the pigment, and have been described under the misnomer of cyanoplasts (Politis). Similar inclusions have also been described in the epidermis of the flowers of Del- phinium cultorum (SCHARINGER). We have shown as well that in the cells of the root cap of barley and of wheat, the
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