. Botany of the living plant. Botany. FILICALES 333 similar habit. In the rools of Ferns, as in those of Seed-Plants, there is a superficial piliferous layer, a broad cortex, and a contracted stele. But usually the inner cortex is very strongly lignified, up to the endoderniis, which is thin-walled (Fig. 273). The pericycle which follows is variable, s-onietinies being greatly enlarged as a water-storage-tissue. The protoxylenis arc peripheral, and two or sometimes more in number, the phloem-groups alterna- ting with them. In fact the root of a Fern is constructed essentially on the plan of th
. Botany of the living plant. Botany. FILICALES 333 similar habit. In the rools of Ferns, as in those of Seed-Plants, there is a superficial piliferous layer, a broad cortex, and a contracted stele. But usually the inner cortex is very strongly lignified, up to the endoderniis, which is thin-walled (Fig. 273). The pericycle which follows is variable, s-onietinies being greatly enlarged as a water-storage-tissue. The protoxylenis arc peripheral, and two or sometimes more in number, the phloem-groups alterna- ting with them. In fact the root of a Fern is constructed essentially on the plan of that in Seed-Planis, As there is no secondary thickening the roots of. Fig. 271. Tracheides of Pteridium. A = the end and about one-third of the length of a tracheide, with part of the lateral wall in surface view, showing scalariform marking (xioo). 5 = part of A magnified 200. C = thin longitudinal section through a lateral wall where two tracheides adjoined (X375). D = similar section through oblique wall at / ( x 200). There the pit mem- branes are not visible. (After De Bary.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
