. Botany for high schools. Botany. Fig. 184. Fig. 185. Two sporocarps still Sporocarp ruptured by surrounded by thallus. growth of egg to form cell Thallus finally decays and mass. Cells of this sporo- sets sporocarp free. phyte forming zoospores. Figs. 184, 185. C. scutata. SIPHON GREEX (SIPHONED). 367. General characters.—The siphon algae are mostly filamentous and branched, but are characterized by the absence of cross walls in the vegetative threads, or by few such walls. The threads are thus like a siphon or tube. There are many nuclei in the protoplasm of a single thread or compart
. Botany for high schools. Botany. Fig. 184. Fig. 185. Two sporocarps still Sporocarp ruptured by surrounded by thallus. growth of egg to form cell Thallus finally decays and mass. Cells of this sporo- sets sporocarp free. phyte forming zoospores. Figs. 184, 185. C. scutata. SIPHON GREEX (SIPHONED). 367. General characters.—The siphon algae are mostly filamentous and branched, but are characterized by the absence of cross walls in the vegetative threads, or by few such walls. The threads are thus like a siphon or tube. There are many nuclei in the protoplasm of a single thread or compartment. The chlorophyll bodies are numerous, small, oval, flattened bodies. Asexual reproduction is by zoospores, or in some cases by non- motile spores. Sexual reproduction is either by the conjugation of small motile gametes, or by the special organs, the sperm and egg cases (antheridia and oogonia). 368. The green felts (Vaucheria).—The ''green felts" are good examples of the siphon algae. They occur in fresh-water. Fig. 186. Vaucheria sessUis, one antheridium between two 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 and Company
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