. Fresh-water biology. Freshwater biology. Fig. 210. Enieromorpha intestinatis L. (Link), a. one-half natural size. (After West.) b. X 360. (Original.) A 193 (192) 194 (19s). 195 (194) Plant in the adult stage a thin, membranaceous plate. . 194 Chromatophore a thin, parietal Hning to the membrane, with one pyrenoid Monostroma Wittrock. The plant in early stages a hollow sack or cylinder, becoming torn later, forming a membranaceous plate, near the base of which certain cells elongate, grow downward and form strength- ening supports. Reproduction by means of zoospores with four cilia and smalle
. Fresh-water biology. Freshwater biology. Fig. 210. Enieromorpha intestinatis L. (Link), a. one-half natural size. (After West.) b. X 360. (Original.) A 193 (192) 194 (19s). 195 (194) Plant in the adult stage a thin, membranaceous plate. . 194 Chromatophore a thin, parietal Hning to the membrane, with one pyrenoid Monostroma Wittrock. The plant in early stages a hollow sack or cylinder, becoming torn later, forming a membranaceous plate, near the base of which certain cells elongate, grow downward and form strength- ening supports. Reproduction by means of zoospores with four cilia and smaller gametes with two cilia. These may germinate without copulation. The membrane is at first very thin, but later becomes gelati- nous so that the cells are more or less separated from each other. Growth is not localized but is intercalary and the cells are often clustered in groups of four. Monostroma buUosum occurs in shallow ditches, partially sub- merged and partially swimming on the surface. Fig. 211. Monostroma buUosum Thuret. X 350. (After Reinke.) Chloroplast star-shaped, radiating from the center, with one pyre- noid Prasiola Meneghini. Plant at first filamentous, but later a plate of cells grouped in small areas. Rhizoids frequent at the base. Reproduction, ac- cording to Lagerheim, in three ways: by isolated portions of the plant, akinetes, and aplanospores. No zoospores known. Ktitzing has established a genus Schizogonium which greatly re- sembles Prasiola. The chromatophore is stellate and the filaments divide longitudinally to form two or more rows. The chief differ- ence between this and Prasiola is that in the latter genus the longitudinal divisions continue, while in the former they cease after the first few times. Wille makes Schizogonium a subsection under Prasiola and is followed in this by West. ,'-â ,} -I Fig. 212. Pfa5to/a cm^a Meneghini. X about 50. and Meneghini.) (After Oltmann 196 (191, 246) Plant filamentous 197 197 (219) Filaments fine, mostly unbran
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
