. The algae. Algae. 62 THE ALGAE akinetes. They are golden green in colour and both species frequent brackish ditches. Some authorities retain this genus in the Ulva- ceae but the differences would appear to be sufficiently distinct to justify its removal to a separate family. Sphaeropleaceae: Sphaeroplea {sphaero, sphere;/j/^a, full). Figs. This genus is widely distributed but is only frequent locally, being most abundant on ground that is periodically flooded by fresh water. The long, free, unbranched filaments consist of elongated coenocytic cells containing up to seventy annular pari
. The algae. Algae. 62 THE ALGAE akinetes. They are golden green in colour and both species frequent brackish ditches. Some authorities retain this genus in the Ulva- ceae but the differences would appear to be sufficiently distinct to justify its removal to a separate family. Sphaeropleaceae: Sphaeroplea {sphaero, sphere;/j/^a, full). Figs. This genus is widely distributed but is only frequent locally, being most abundant on ground that is periodically flooded by fresh water. The long, free, unbranched filaments consist of elongated coenocytic cells containing up to seventy annular parietal chloroplasts with pyrenoids. The plastids have denticulate margins and occupy the periphery of discs of cytoplasm, the discs being 1. Fig- 33 Sphaeroplea. A, S. annulina, portion of thallus. B, 5. annulina chloroplast. C, structure of septum in 5. africana ( X 375). D, female plant with ova and antherozoids. E, male plant. F, young zygote. G, zygote with thickened wall. H, I, young gametophytes. J, spores emerging from zygote. K, L, 5". africana, transverse sections across the septa ( x 375). (A-C, K, L, after Fritschi D-J, after Oltmarms.). 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
