MUSCI. 
373 
succeeding ones from its last segments, in the same manner as the antheridia of 
the same genus, and those of Radula and Fontinalis. According to preparations 
which Schuch obtained in the laboratory at Würzburg, the first archegonium 
arises also in typical Mosses from the apical cell of the shoot. 
The order of succession of the cells in the development of the archegonium 
has been studied by Kühn in AndrecEa, and by Janczewski in the Phascacese, Bryinese, 
and in Sphagnum. As in the Liverworts so here also, the whole archegonium is 
derived from an outgrowth of a superficial cell of the punctum vegetationis. This 
is divided by a transverse wall {nim^ Fig. 255 y4) so as to form a lower cell 
(corresponding to the pedicel of the Liverworts) and an upper external cell, in 
^7" i 
7 
Fig. 255.— First stage of development of the archego- 
nium oi Andrecea (after Kühn); A terminal archegonium 
arising from the apical cell of the shoot ; b b the youngest 
leaves; B after the formation of the central cell and stig- 
matic cell ; C transverse section of the young ventral 
portion. 
Fig. 2e,e.—Funarza hygrometrica ; A longitudinal section of the summit of a weak female plant (X loo), (i archegonia, 
b leaves; B an archegonium (x 550), b ventral portion with the oosphere, h neck, mouth still closed; the canal-cells are 
beginning to be converted into mucilage (the preparation had lain three days in glycerine) ; C the part near the mouth of the 
neck of a fertilised archegonium, with dark red cell-walls. 
which, as in the corresponding cell of the antheridium, two oblique walls inclined 
in opposite directions appear. The two oblique cells thus cut off give rise, at a 
later period, to the tissue of the lower part of the ventral portion of the archegonium, 
which is here more developed than in the Liverworts (Fig. 256, B). The upper 
cell undergoes the same divisions as it does in the Liverworts ; the mode of 
formation of the ventral wall and of the central cell is the same in this group as 
in that ; but the formation of the neck is here quite different. Whereas in the 
Liverworts the first transverse division of the internal cell produces an upper cell 
which at once represents the ' stigma' of the archegonium, the cell thus formed 
