. Elementary botany. Botany. 144 MORPH-orOGY. 303. Sexual organs of vaucheria. Antheridium.âThe antheridia are short, slender, curved branches from a main thread. A se[)tum is formed which separates an end portion from the stalk. This end cell is the aniheridiiim. Frequently it is collapsed or empty as shown in fig. 140. The protoplasm in. Fig. 140. Vaucheria sessilis, one antheridium between twn rtogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. Wlien these are formed the antherid- ium opens at the end and they escape. It is after the escape of
. Elementary botany. Botany. 144 MORPH-orOGY. 303. Sexual organs of vaucheria. Antheridium.âThe antheridia are short, slender, curved branches from a main thread. A se[)tum is formed which separates an end portion from the stalk. This end cell is the aniheridiiim. Frequently it is collapsed or empty as shown in fig. 140. The protoplasm in. Fig. 140. Vaucheria sessilis, one antheridium between twn rtogonia. the antheridium forms numerous small oval bodies each with two slender lashes, the cilia. Wlien 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. 304. Oogoniiim.âThe oogonia are short branches also, but they become large and , > 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, ,, , . ... ^'^' '*'â ^ ' Vauchena sessiiis; oogonium opening and emit- as shown in the figure, is tins a bit of protoplasm ; spermatozoids , sperma- o ' tozoids entering oogonium, (Alter Pnngslieim and usually turned somewhat i'"*ei.) to one side. When mature the |)oinled end ojiens 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 b\' a thick brown wall, with stan h)' 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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