. Elementary botany. Botany. BROWN AND RED ALG^. 117 phycecc (floridese). In gracillaria these fruit bodies occur scattered over the thallus. They are somewhat flask-shaped, are partly sunk in the. Fig. 122. Antheridia of fucus, branched threads. Fig. 123. Fig. 124. Antheridia of fucus with Egg of fucus surrounded escafping spermatozoids. by speriQatozoids. thallus, and the conical end projects strongly above the surface. The car- pospores are grouped in radiating threads within the oval cavity of the y''T:'li'-' Fig. 125. Fertilization in fucus ;/?£, female nucleus ; 7«?z, male nucleus";
. Elementary botany. Botany. BROWN AND RED ALG^. 117 phycecc (floridese). In gracillaria these fruit bodies occur scattered over the thallus. They are somewhat flask-shaped, are partly sunk in the. Fig. 122. Antheridia of fucus, branched threads. Fig. 123. Fig. 124. Antheridia of fucus with Egg of fucus surrounded escafping spermatozoids. by speriQatozoids. thallus, and the conical end projects strongly above the surface. The car- pospores are grouped in radiating threads within the oval cavity of the y''T:'li'-' Fig. 125. Fertilization in fucus ;/?£, female nucleus ; 7«?z, male nucleus"; ?;, nucleolus. In the left figure the male nucleus is shown moving down through the cytoplasm of the egg; in the remaining figures the cytoplasm of the egg is omitted. (After Strasburger.) cystocarp. These cystocarps are developed as a result of fertilization. Other plants bear gonidia in groups of four, the so-called tetraspores. 272. Ehabdonia.—This plant is about the same size as the gracillaria, though it possesses more filiform branches. The cystocarps form prominent elevations, while the carpospores lie in separated groups around the periph- ery of a sterile tissue within the cavity. (See figs. 128, 129.) Gonidia in the form of tetraspores are also developed in 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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