. Elementary botany. Botany. FERNS. 183 attaches the embryo to the prothallium, and transports nourishment for the embryo until it can become to the soil and lead an indeijendent ex- istence. During this time the wall of the archegonium grows somewhat to accommodate the increase in size of the embryo, as shown in figs. 229, 230. But soon the wall of the archegonium is ruptured and the embryo emerges, the root attaches itself to the ?oil, and soon the prothallium dies. The embryo is first on the under side of the prothallium, and the first leaf. Fig. 228. Two-celled embryo of Pteris s
. Elementary botany. Botany. FERNS. 183 attaches the embryo to the prothallium, and transports nourishment for the embryo until it can become to the soil and lead an indeijendent ex- istence. During this time the wall of the archegonium grows somewhat to accommodate the increase in size of the embryo, as shown in figs. 229, 230. But soon the wall of the archegonium is ruptured and the embryo emerges, the root attaches itself to the ?oil, and soon the prothallium dies. The embryo is first on the under side of the prothallium, and the first leaf. Fig. 228. Two-celled embryo of Pteris serrulata. Remnant of archegonium neck below. and the stem curves upward between the lobes of the heart-shaped body, and then grows upright as shown in fig. 231. only one embryo is formed on a single prothallium, but in one case I found a prothallium with two well- formed embryos, which are figured in 232. 375. Comparison of ferns with liverworts and mosses.—In the ferns then we have reached a remarkable condition of things as compared with that which we found in the mosses and liverworts. In the mosses and liverworts. 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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