. Elementary botany. Botany. VA UCHERIA. 107 251. Sexual organs of vaucheria. Antheridium.—The antheridia are short, slender, curved branches from a main thread. A septum is formed which separates an end portion from the stalk. This end cell is the antheridium. Frequently it is collapsed or empty as shown in fig. 108. The protoplasm in. Fig io8. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these
. Elementary botany. Botany. VA UCHERIA. 107 251. Sexual organs of vaucheria. Antheridium.—The antheridia are short, slender, curved branches from a main thread. A septum is formed which separates an end portion from the stalk. This end cell is the antheridium. Frequently it is collapsed or empty as shown in fig. 108. The protoplasm in. Fig io8. Vaucheria sessilis, one antheridium between two oogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. When these are formed the antherid- ium opens at the end and they escape. It is after the escape of these spermatozoids that the antheridium is collapsed. Each spermatozoid is a male gamete. 252. Oogonium.—The oogonia are short branches also, but they become large and jl somewhat oval. The / ' septum which separates the . protoplasm from that of "" the main thread is as we see near the junction of the branch with the main thread. The oogonium, as shown in the figure, is usually turned somewhat to one side. When mature the pointed end opens and a bit of the protoplasm escapes. The remaining protoplasm forms the large rounded egg cell which fills the wall of the oogonium. In some of the oogonia which we examine this egg is surrounded by a thick brown wall, with starchy and oily contents. This is the. 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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