366 Burt . — The Development of 
part of the stipe. The two opposite sides of this zone are 
parallel, as shown in Fig. 12. The undifferentiated tissue A 
is thus separated from the tissue c of the pits by only a single 
layer or plate of pseudoparenchymatous nature, and extends 
in the opposite direction to the gleba. Ed. Fischer has 
described such a condition of this part of the wall and of 
the tissue A as the permanent condition in Mutinies Miiller i \ 
Such a condition is not permanent, however, in M. caninus . 
The two surfaces of the wall in this region are no longer 
parallel in the older stage of Fig. 13. The section of the 
outer surface has become nearly a straight line. This has 
resulted from the formation of a second plate of pseudo- 
parenchyma just outside the first one. It has not conformed 
to the first plate, but extends more directly from prominence 
to prominence of that plate. The hyphae of the tissue A i 
which are shown in Fig. 12 directly connected with the 
first plate k, and those in the angles between the pits became 
pseudoparenchymatous also when the second plate was formed, 
and may be seen connecting the two plates in Fig. 15. I desire 
to call attention to this point, for although the two plates 
of the partition-wall between the rest of the tissue A and 
the pits c are not formed simultaneously, in other respects the 
mode of formation of this partition-wall is the same as that 
which I have described in connexion with the chambers lower 
down the stipe. 
The differentiation of the second plate began at the outer 
surface of the wall in the region below the pits, and then 
advanced upwards ; hence this plate cannot be regarded as 
homologous with the veil or pileus of other genera of the 
Phalleae. 
Advanced Stages. 
As already stated, the advanced stages may be regarded as 
those in which the walls have become folded. In these stages 
the cell-like bodies of pseudoparenchyma, which constitute 
1 L. c., 1890, p. 32, fig. 25. 
