Organography of plants, especially of the archegoniatae and spermaphyta . Fig. I20. Nanomitriuin tenerum. Archegonium after fertilization and 3oung sporogonium at different stagesof development in longitudinal section. /, young embrjo slill within the archegonial venter. //, older embrj-o;the endotliecium is shaded ; the foot, F^ has bored into the stalk of the archegonium : .S, stalk of the , still older embrjo ; a, amphithecium divided by periclinal walls. IV, sporogonium showing the sporocytes ingreat part separate around the columella. In most of the sporocytes the contents
Organography of plants, especially of the archegoniatae and spermaphyta . Fig. I20. Nanomitriuin tenerum. Archegonium after fertilization and 3oung sporogonium at different stagesof development in longitudinal section. /, young embrjo slill within the archegonial venter. //, older embrj-o;the endotliecium is shaded ; the foot, F^ has bored into the stalk of the archegonium : .S, stalk of the , still older embrjo ; a, amphithecium divided by periclinal walls. IV, sporogonium showing the sporocytes ingreat part separate around the columella. In most of the sporocytes the contents are indicated, in others theyare absent, having fallen out in process of sectioning. All magnified; / the most highly magnified. a periclinal wall (Fig. 122, i), and thus we have four inner cells which may be calledthe endothecium, and a number of outer ones which may be called the amphithecium(Fig. 120, //, ///). A primitive sporogonium would be one in which the amphithe-cium formed the wall of the sporogonium, whilst the endothecium gave rise to thespores. As a fact
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Keywords: ., bookcentury1900, bookdecade1900, bookido, booksubjectplantanatomy
