. A text-book of botany for secondary schools. Botany. 108 A TEXT-BOOK OF BOTANY (3) Sexual reproduction is indicated by âo\^ âo\^ -P â -o\. -P, 0/ ( â0/ ( â0/ indicating that two special cells (gametes) are produced by the plant, that these two fuse to form one (oospore), which then produces a new plant. 66. Cladophora.âThis plant is found attached to sticks and stones at the edge of ponds or lakes, and is often so abundant as to form thick mats of long anchored filaments. It is easily distinguished from Ulothrix, for it is a much coarser plant and branches freely (Fig. 98). It is mentioned h
. A text-book of botany for secondary schools. Botany. 108 A TEXT-BOOK OF BOTANY (3) Sexual reproduction is indicated by âo\^ âo\^ -P â -o\. -P, 0/ ( â0/ ( â0/ indicating that two special cells (gametes) are produced by the plant, that these two fuse to form one (oospore), which then produces a new plant. 66. Cladophora.âThis plant is found attached to sticks and stones at the edge of ponds or lakes, and is often so abundant as to form thick mats of long anchored filaments. It is easily distinguished from Ulothrix, for it is a much coarser plant and branches freely (Fig. 98). It is mentioned here both because it is common and be- cause it illustrates a branching filamentous body. Just as in Ulothrix, reproduction in Clado- phora is carried on by means of swimming spores, and also by the fusion of swimming gametes to form oospores. 67. (Edogonium. â The fila- ments of (Edogonium are long and simple, the lowest cell act- ing as a holdfast, as in Ulothrix and Cladophora. In each cell a nucleus may be seen (Fig. 99), and apparently several chloroplasts; but really there is only one large complex chloroplast. Any one of these cells may produce within itself a single large swimming spore, which escapes from the mother-cell into the water (Fig. 99, C). At its more pointed clear end there is a little crown of cilia, by means of which it swims about rapidly. These spores finally anchor themselves, and each one produces a new filament (Fig. 99, D and E).. Fig. 98.âCladophora: a branch- ing filament, each of whose cells contains several 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
Size: 1218px × 2052px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
