Elementary botany . Nearly mature sporogonium of Riccia crystallina;mature spore at the right. Fig. glauca; archegoniumcontaining nearly mature spo-rogonium. sg, spore-producingcells surrounded by single layerof sterile cells, the wall of thesporogonium. fours are the spores. At this time the wall of the spore-case dis-solves, the spores separate from each other and fill the now en-larged venter of the archegonium. When the thallus dies theyare liberated, or escape between the loosely arranged cells ofthe upper surface. 481. A new phase in plant life.—Thus we have here in thesporogo
Elementary botany . Nearly mature sporogonium of Riccia crystallina;mature spore at the right. Fig. glauca; archegoniumcontaining nearly mature spo-rogonium. sg, spore-producingcells surrounded by single layerof sterile cells, the wall of thesporogonium. fours are the spores. At this time the wall of the spore-case dis-solves, the spores separate from each other and fill the now en-larged venter of the archegonium. When the thallus dies theyare liberated, or escape between the loosely arranged cells ofthe upper surface. 481. A new phase in plant life.—Thus we have here in thesporogonium of riccia a very interesting phase of plant life, inwhich the egg, after fertilization, instead of developing directlyinto the same phase of the plant on which it was formed,grows into a quite new phase, the sole function of which is thedevelopment of spores. Since the form of the plant on which thesexual organs are developed is called the gametophyie, this newphase in which the spores are developed is termed
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
