. The structure and development of mosses and ferns (Archegoniatae). e the food mate-rials taken in from the gametophyte. The gradual transitionof the differentiated tissues above into the meristem at the base,is precisely as in Anthoccros, and sections at that point in thetwo genera can scarcely be distinguished from one columella (in longitudinal section) in both shows four par-allel rows of cells, outside of which lies the single row of arche-sporial cells, and four rows of cells belonging to the wall of thecapsule. As the section is examined higher up, however, there aremarked
. The structure and development of mosses and ferns (Archegoniatae). e the food mate-rials taken in from the gametophyte. The gradual transitionof the differentiated tissues above into the meristem at the base,is precisely as in Anthoccros, and sections at that point in thetwo genera can scarcely be distinguished from one columella (in longitudinal section) in both shows four par-allel rows of cells, outside of which lies the single row of arche-sporial cells, and four rows of cells belonging to the wall of thecapsule. As the section is examined higher up, however, there aremarked differences, especially in the divisions of the arche-sporium. The first divisions in the archesporium of Notothylasare periclinal, and for a short distance it is two-layered, as it ispermanently in Anthoccros; but still further up it widens veryrapidly by the formation of repeated periclinal walls, and sooncomes to be much thicker than either the columella or the capsulewall. A further study of the developing archesporium shows 154 MOSSES AND FERNS CHAP. e^ <^.
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
