. Fresh-water biology. Freshwater biology. 148 FRESH-WATER BIOLOGY 98 (99) Cells at the ends of, or distributed along rather firm, often lamellate gelatinous strands Hormotila Borzi. Chromatophore single, granular, without a pyrenoid. Re- production by cell division, also by bi-ciliate zoospores, eight of which are formed in a single zoosporangium. The zoospo- rangia are much larger than the vegetative cells. Fig. 156. Hormotila mucigena Borzi. X 268. (After West.) 99 (98) Cells distributed throughout a structureless, cylindrical, branched gelatinous colony Palmodactylon Nageli. Cells spherica
. Fresh-water biology. Freshwater biology. 148 FRESH-WATER BIOLOGY 98 (99) Cells at the ends of, or distributed along rather firm, often lamellate gelatinous strands Hormotila Borzi. Chromatophore single, granular, without a pyrenoid. Re- production by cell division, also by bi-ciliate zoospores, eight of which are formed in a single zoosporangium. The zoospo- rangia are much larger than the vegetative cells. Fig. 156. Hormotila mucigena Borzi. X 268. (After West.) 99 (98) Cells distributed throughout a structureless, cylindrical, branched gelatinous colony Palmodactylon Nageli. Cells spherical; gelatinous tubes branched or unbranched, single or in clusters. Division of cells first in one, later in three directions. Chromatophore parietal and often lobed. The elongated shape of these colonies is thought by West to be due to divisions occur- ring more frequently in one direction than in others. The plant occurs in swamps and quiet Fig. 157. Palmodactylon sp. colony. X about 600. Portion of young (Original.) 100 (97) Cells two or four in series, at the ends of attached, dichotomously branched stalks; chromatophores several. Mischococcus Nageli. Chromatophores one to four, without pyrenoids. Reproduction by zoospores and isogametes which may or may not unite before germina- tion. Fig. 158. Mischococcus conferoicola'ii', X about 180. (After Rabenhorst.) loi (97, 100) Cells in radiating series, often branched, held together by gelatinous strands Dictyocystis Lagerheim. Chromatophore single, central, and radial. Reproduction probably by division. Though Dictyocystis is reported by several botanists, it seems a somewhat doubtful genus. 102 (96, 107) Cells at the surface of an invisible gelatinous mass and borne on fine, radiating gelatinous strands 104 103 (104, 105, 106) Cells reniform, four on a stalk, two borne near the adjoin- ing ends of the other two. . Dimorophococcus A. Braun. Chromatophore single and parietal, each group of cells formed by the intern
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
