Mutinies caninus ( Hnds . ), Fr. 369 
of new hyphal ends (basidia) into this layer, its surface 
becomes greatly enlarged and the layer is thrown into folds. 
During this process it becomes torn from the intermediate 
tissue. 
The rudiment of the stipe arises in the intermediate tissue 
A, lying next to the central column R , by the formation of 
a zone of deeply staining tissue rich in protoplasm. 
Somewhat later, masses of tissue in the dense and intricately 
interwoven rudiment of the stipe show a tendency towards 
gelatinization. These masses mark the position of the later 
chamber-cavities in the wall. Towards the upper end of the 
stipe, such masses are in contact with the central column R, 
and they mark the position of the ‘ pits ’ which open into the 
main central cavity of the stipe in mature stages of M. 
caninus. 
The tissue of the rudiment of the partition-walls, situated 
about and between the gelatinous masses, continues its 
development into pseudoparenchyma, which, with conditions 
for its development most favourable where it is in contact 
with the gelatinous tissues and the presumably food-supplying 
tissue becomes relatively more and more dense next to 
those surfaces, and more open, by contrast, between those 
surfaces. In later stages, before folding of the wall has gone 
too far, this gives to the partition-wall the appearance of 
being composed of two plates rather loosely connected 
together. 
At no stage in the course of development was the rudiment 
of the stipe found to consist of hyphal knots isolated from 
each other and from the surrounding tissues by narrow open 
spaces. 
The chamber-walls are thrown into folds through a more 
rapid growth of the pseudoparenchyma than that of other 
parts of the egg. 
Final elongation of the stipe and elevation of the gleba is 
brought about through the straightening out of the folds in 
the chamber-walls. 
