. Elementary botany . Fig. 202. Two different stages of young sporogonium of cylinder is a moss, still within the archegonium and wedg- This is the columella, and is pres- mg their way into the tissue of the end of the stem. r /i, neck of archegonium ; /, young sporogonium. ent in nearly all the mosses. Each This shows well the connection of the sporophyte r lt â r ., r ,., â . with the gametophyte. of the cells of the fertile layer divides into four spores. 342. Development of the sporogonium.âThe egg cell after fertilization divides by a wall crosswise to the axis of the archegonium. Each of
. Elementary botany . Fig. 202. Two different stages of young sporogonium of cylinder is a moss, still within the archegonium and wedg- This is the columella, and is pres- mg their way into the tissue of the end of the stem. r /i, neck of archegonium ; /, young sporogonium. ent in nearly all the mosses. Each This shows well the connection of the sporophyte r lt â r ., r ,., â . with the gametophyte. of the cells of the fertile layer divides into four spores. 342. Development of the sporogonium.âThe egg cell after fertilization divides by a wall crosswise to the axis of the archegonium. Each of these cells continues to divide for a time, so that a cylinder pointed at both ends is formed. The lower end of this cylinder of tissue wedges its way down through the base of the archegonium into the tissue of the end of the moss stem as shown in fig. 202. This forms the foot through which the nutrient
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
