. The structure and development of mosses and ferns (Archegoniatae). , from a lower cell, which forms amore or less conspicuous appendage at the base of the earliest divisions in the upper part are not known, but itsoon becomes a cylindrical body consisting of several tier3 of in THE JUNGERMANNIALES 95 cells, each composed of four equal quadrant cells. Accordingto Leitgeb (i), the upper tier, from which the capsule develops,is formed by the first transverse wall in the up])er part of theembryo. This upper tier is next divided by nearly transversewalls into four terminal cover cells, a
. The structure and development of mosses and ferns (Archegoniatae). , from a lower cell, which forms amore or less conspicuous appendage at the base of the earliest divisions in the upper part are not known, but itsoon becomes a cylindrical body consisting of several tier3 of in THE JUNGERMANNIALES 95 cells, each composed of four equal quadrant cells. Accordingto Leitgeb (i), the upper tier, from which the capsule develops,is formed by the first transverse wall in the up])er part of theembryo. This upper tier is next divided by nearly transversewalls into four terminal cover cells, and four larger ones below,and these latter are again divided each into three cells, an innerone and two outer ones, so that the capsule consists of fourcentral cells, the archesporium, and twelve wall cells (Fig. 45,A). A similar division in the lower tiers results in the forma-tion of four axial rows and a single outside layer of cells inthe stalk. In the lowest tiers the divisions are much less regu-lar, and the foot, which is not very largely developed, shows A.
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