. Fresh-water biology. Freshwater biology. i68 FRESH-WATER BIOLOGY 233 (220) Chromatophore a single equatorial band, with one pyrenoid. Fila- ments branched, attached, frequently with a gelatinous cov- ering. Reproduction by zoospores and isogametes. Family Chaetophoeaceae . 234 234 (242) The zoosporangia of the same form as the vegetative cells; the larger species usually bearing long hairs. Subfamily Cha'etophoreae . 235 ^iS (239) Plant attached, differentiated into base and apex 236 236 (237, 238) Filaments imbedded in a firm, gelatinous matrix, forming a spherical or an irregularly branche
. Fresh-water biology. Freshwater biology. i68 FRESH-WATER BIOLOGY 233 (220) Chromatophore a single equatorial band, with one pyrenoid. Fila- ments branched, attached, frequently with a gelatinous cov- ering. Reproduction by zoospores and isogametes. Family Chaetophoeaceae . 234 234 (242) The zoosporangia of the same form as the vegetative cells; the larger species usually bearing long hairs. Subfamily Cha'etophoreae . 235 ^iS (239) Plant attached, differentiated into base and apex 236 236 (237, 238) Filaments imbedded in a firm, gelatinous matrix, forming a spherical or an irregularly branched, ribbon-like thaUus attached at the base Chaetophora Shrank. Filaments radiating from a common center, usually terminating in a colorless hair; micro- zoospores with two ciha and a pigment spot near the anterior end; macrozoospores also ©>-< Fig. 232. Chaetophora pisi/ormis Agardh. X loo. (Original.) 237 (236, 238) Filaments not imbedded in a firm gelatinous matrix, the branches irregularly placed, of the same size as the principal axis Myxonema Fries. Plant either several centimeters long, at- tached, or very minute and free, often passing into a palmella condition. Sexual reproduc- tion by means of isogametes with two cilia and a pigment spot; asexual, by zoospores with four cilia, and by akinetes. Myxonema is widely distributed, the mi- croscopical forms occurring almost univer- sally on mosses and liverworts in damp local- ities, while the larger forms are frequent in running water. They have been known to completely cover the beds of streams. The smaller forms are microscopical, and can be detected only after portions of the mosses and liverworts are placed in culture and the Myxonema allowed to develop. It will then sometimes cover the top of a culture with a thin film of minute plants. Fig. 233. Myxonem lubricum Kiitzing. a. portion of branch, b. isogoraetes. c. zoospores. X285. (Original.). Please note that these images are extracted from scanned page
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
