. Foundations of botany. with the Magnifying Glass. — The magnifyingglass will show the growth of Vaucheria to consist of numerousgreen filaments similar to those of Spirogyra. Select a small portionand spread out the filaments carefully in a drop of water on a the glass reveal any indications of cross-partitions, of branch-ing, or of fruiting organs as short lateral branches ? Does it showthe form or arrangement of the green coloring matter? 283. Examination with the Microscope. — Prepare as directedfor the magnifying glass and place a cover-glass over the prepara-tion, with suffic
. Foundations of botany. with the Magnifying Glass. — The magnifyingglass will show the growth of Vaucheria to consist of numerousgreen filaments similar to those of Spirogyra. Select a small portionand spread out the filaments carefully in a drop of water on a the glass reveal any indications of cross-partitions, of branch-ing, or of fruiting organs as short lateral branches ? Does it showthe form or arrangement of the green coloring matter? 283. Examination with the Microscope. — Prepare as directedfor the magnifying glass and place a cover-glass over the prepara-tion, with sufficient water. With the lowest power observe the 246 FOUNDATIONS OF BOTANY continuity of the cell-cavity and (in young plants growing on soil)search for root-like portions, in those growing in water for branch-ing portions, and fruiting organs in the form of swellings or shortlateral branches. With a power of about thirty to sixty diameters sketch a selectedplant of moderate extent as nearly complete as possible or else. Fig. 180.— Vauchtria Kynanilra. A, a filament with archegonia and antlieridia (considerably magnified); B, partof same much more highly magnified; o, oogonium ; a, antheridium ; C, alater stage of JS; D, end of a filament with a zoospore, z, escaping (highlymagnified). sketch a portion showing the branching and a root-like i) and indicate the absence or presence and arrangement ofchlorophyll. Can Vaucheria probably use carbon dioxide ? 284. Reproduction in Vaucheria. — Make an outline sketch offruiting organs, if found. See if any filaments can be found withthe contents massing or escaping at the tips. In some species TYPES OF CRYPTOGAMS; THALLOPHYTES 247 zoospores are formed in this way, having their entire surface clothedwith cilia. They are the largest motile cells known. In other spe-cies a portion of the filament is separated and cut off by a spores soon germinate and may be found in various stages ofgrowth. They often serve
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
