. A manual of botany. Botany. 30 MANUAL OF BOTANY the separating walls are present, so that the filament is divided into a number of chambers, which are not cells but coenooytes. This eoenocytio structure may extend into some of the mor- phologically most highly complex bodies. Thus the Alga Caulerpa, which attains considerable size and whose body shows rounded stems and much-divided leaves, is composed of only a single coenocyte, whose cavity extends through all the ramifica- tions of the plant. The Fungus Mucoi- mucedo shows a similar structure {fig. 780). In cases where the Thallophyte is c
. A manual of botany. Botany. 30 MANUAL OF BOTANY the separating walls are present, so that the filament is divided into a number of chambers, which are not cells but coenooytes. This eoenocytio structure may extend into some of the mor- phologically most highly complex bodies. Thus the Alga Caulerpa, which attains considerable size and whose body shows rounded stems and much-divided leaves, is composed of only a single coenocyte, whose cavity extends through all the ramifica- tions of the plant. The Fungus Mucoi- mucedo shows a similar structure {fig. 780). In cases where the Thallophyte is composed of masses of Fig. Fig. 7 CoEuocyte of Mucor mucedo. cells there may be considerable histological differentiation, or there may be but little. In some of the brown seaweeds we find a limiting layer, enclosing a very different internal tissue. In some this is composed of elongated loosely arranged cells with mucilaginous cell walls ; in others it shows differentiation into more complex structures. Thus in Macrocystis we find under the epidermal layer a layer of thin-walled parenchyma covering a layer of somewhat prosenchymatous cells with thickened walls, sometimes with pits upon them. The inner portion of this contains the well-marked sieve tubes already referred to. Some of the large Algae of the same group as. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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