365 
Mutinus caninus (dfuds.), Fr. 
Ninth egg . — The following stages in the development of the 
egg are better known, and can be treated more briefly. 
A section through the stipe and adjoining parts of an egg 
13 mm. long is shown in Fig. 13. The section is median 
at the upper and lower ends of the stipe, but is slightly 
oblique about midway between the ends on account of the 
curvature of the stipe. This gives a somewhat irregular 
outline to the wall on its inner side in that region. 
In its lower portion, the wall of the stipe contains but 
a single layer of chambers, and these have thin walls ; near 
the middle, the wall is thicker, and its chambers are more 
numerous and more irregular in form ; higher up, the pits 
have become swollen with tissue from the column R, and 
the wall has become very massive. This massive portion 
is not thrown into folds in the advanced stages of the eggs. 
It is the portion upon which the gleba rests. Can it have 
become massive in order to give a more rigid support for the 
gleba in its development ? 
Some chambers in the wall of the stipe are closed/ their 
tissue having no connexion with the intermediate tissue 
A except through pseudoparenchyma. A portion of the 
wall, showing many places of direct connexion of the inter- 
mediate tissue with that of the chambers, is shown in Fig. 14 
under low magnification. Such passages into the chambers 
become the pores or perforations which are found in the outer 
surface of the stipe after its elongation. The figure shows 
also by the darker shading the denser structure of the wall 
of pseudoparenchyma along the surfaces. Perhaps the more 
favourable conditions for the development of that tissue in 
those surfaces may be due to proximity to a tissue containing 
available food. 
Mode of thickening the wall in the spore-bearing part T . — In 
the upper part of the wall of the stipe in Fig. 8, the pseudo- 
parenchymatous hyphae form a single narrow zone bounding 
the pits, and so forming a very irregular outline for that 
1 Compare also Ed. Fischer on this topic in his already cited paper of 1895 , 
P* 135. fi g s - 5-8- 
