. Practical botany. Botany. 204 PRACTICAL BOTANY form somewhat like Pleurococcus, is frequently found in stag- nant water. It sometimes grows so luxuriantly in barnyard and roadside pools as to give the water a bright green appear- ance, and its resting spores may impart a dark red color to the drying pools in which the plants have flourished. Of the near rela- tives of Sjnrogyra there are several kinds, some of which are Zygnema (Fig. 166), Mesocarpus (Fig. 167), and the desmids (Fig. 168). The desmids are pe- culiarly fantastic forms, one-celled, but often found in colonies. They usually app
. Practical botany. Botany. 204 PRACTICAL BOTANY form somewhat like Pleurococcus, is frequently found in stag- nant water. It sometimes grows so luxuriantly in barnyard and roadside pools as to give the water a bright green appear- ance, and its resting spores may impart a dark red color to the drying pools in which the plants have flourished. Of the near rela- tives of Sjnrogyra there are several kinds, some of which are Zygnema (Fig. 166), Mesocarpus (Fig. 167), and the desmids (Fig. 168). The desmids are pe- culiarly fantastic forms, one-celled, but often found in colonies. They usually appear in stagnant waters. As in Sjnrogyra, these plants repro- duce themselves by formation of zygospores. Con- ferva, which re- sembles Ulothrix (see Fig. 159), is fairly abundant in ponds and along margins of lakes. Draparnaldia is a branching form (Fig. 160) which resembles Gladophora and Vaucheria ; Ulva, or sea lettuce, is a peculiar large salt-water form; while Ooleochcete (Fig. 169) is a disk-like or plate-like form. Ohara, or stonewort (Fig. 170), is a complex alga that is found in great abundance upon the bottom of shallow lakes and streams throughout the continent. It has a heavy coating. Fig. 167. Mesocarpus c, conjugating cells which have bent toward one another and are producing conjugating tubes; p, a start toward conjugation with a third plant. Greatly enlarged. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
Size: 1477px × 1692px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
