. Elementary botany . Embryo of fern i Adiantum concinnum) still surrounded by the archegonium, which has grown in size, forming the " ; L, leaf; S, stem; A', root; J*\ foot. mosses, especially as compared with the size of the spore-bearing phase. The gametophyte phase or stage of the plants, then, is decreasing in size and durance as the sporophyte stage is increasing. We shall be interested to see if this holds good of the fern allies, that is of the plants which belong to the same group as the ferns. And as we come later to take up the stud}' of the higher plants we must
. Elementary botany . Embryo of fern i Adiantum concinnum) still surrounded by the archegonium, which has grown in size, forming the " ; L, leaf; S, stem; A', root; J*\ foot. mosses, especially as compared with the size of the spore-bearing phase. The gametophyte phase or stage of the plants, then, is decreasing in size and durance as the sporophyte stage is increasing. We shall be interested to see if this holds good of the fern allies, that is of the plants which belong to the same group as the ferns. And as we come later to take up the stud}' of the higher plants we must bear in mind to cany on this comparison, and -re- if this progression on the one hand of the sporophyte continues, and if the retrogression of the gametophyte continues also.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
