. Elementary botany. Botany. 126 MOfiPHOLOG Y. power the two cilia on the end may be seen, or we may make them more distinct by treatment with Schultz's solution, draw- ing some under the cover glass. The zoogonidium is oval and the cilia are at the pointed end. After they have been at rest. Fig. 139- Downy mildew of grape (Plasmopora viti- cola), showing tuft of gonidiophores bearing gonidia, also intercellular mycelium. (After Millardet.) Fig. 140. Phytophthora infestans showing pe- culiar branches; gonidia below. for some time they often slip out of the thin wall, and swim again, this time
. Elementary botany. Botany. 126 MOfiPHOLOG Y. power the two cilia on the end may be seen, or we may make them more distinct by treatment with Schultz's solution, draw- ing some under the cover glass. The zoogonidium is oval and the cilia are at the pointed end. After they have been at rest. Fig. 139- Downy mildew of grape (Plasmopora viti- cola), showing tuft of gonidiophores bearing gonidia, also intercellular mycelium. (After Millardet.) Fig. 140. Phytophthora infestans showing pe- culiar branches; gonidia below. for some time they often slip out of the thin wall, and swim again, this time with the two cilia on the side, and then the zoogonidium is this time more or less bean-shaped or reniform. 283 Sexual reproduction of saprolegnia When such cultures are older we often see large rounded bodies either at the end of a thread, or of a branch, which contain several smaller rounded bodies as shown in fig. 135. These are the oogonia (unless the plant is attacked by a parasite), and the round bodies inside are the egg cells, if beiore fertilization, or the eggs, if. 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
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