. Lessons in botany. Botany. leaf will be dissolved. After a few minutes we wash the sec- tions in water on a glass slip, and stain them with a solution of eosin. If the sections were carefully made, and thin, the threads of the mycelium will be seen coursing between the cells of the leaf as slender threads. Here and there will be seen short branches of these threads which penetrate the cell wall of the host and project into the interior of the cell in the form of an irregular knob. Such a branch is a haustorium. By means of this haustorium, which is here only a short branch of the mycelium, n
. Lessons in botany. Botany. leaf will be dissolved. After a few minutes we wash the sec- tions in water on a glass slip, and stain them with a solution of eosin. If the sections were carefully made, and thin, the threads of the mycelium will be seen coursing between the cells of the leaf as slender threads. Here and there will be seen short branches of these threads which penetrate the cell wall of the host and project into the interior of the cell in the form of an irregular knob. Such a branch is a haustorium. By means of this haustorium, which is here only a short branch of the mycelium, nutritive substances are taken by the fungus from the proto- plasm or cell-sap of the carnation. From here it passes to the threads of the mycelium. These in turn supply food material for the development of the dark brown gonidia, which we see form the dark-looking powder on the spots. Many other fungi form haustoria, which take up nutrient matters in the way described for the carnation rust. 160. Nutrition of the dodder.—The dodder (cuscuta) is an example of one of the higher plants that is parasitic. The stem twines around the stems of other plants, sending short conical processes termed haustoria in their tissues. By means of these the nutriment is absorbed from the host. The means of absorb-. Fig. 63. Carnation rust on leaf and flower stem. From 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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