8 Kingo Miyabe.—On the Life-history of 
hyphae ; and there were no swellings to be seen at their 
bases. 
The spores were formed as a general rule from the terminal 
portions of the fertile hyphae by abstriction. The cell, from 
which both the spore and swollen spore-bearing cell (basidium) 
were to be formed, was at first tapering towards its free end 
(Fig. 5 a). The abstriction took place usually at a point a little 
above its middle part, without being at the same time accom- 
panied by the formation of a partition. The lower half attained 
its full size while the spore-portion was yet small. The latter 
was at first ovate in form, colourless, and smooth (Fig. 5 c ). 
The roughening and darkening of its cell-wall began to take 
place when two or three cross-partitions were formed in the 
spore. In the course of a few days the spore ripened and 
presented its characteristic muriform shape. The connection 
between the spore and basidium was very slight. As a con- 
sequence, the ripened spore fell off at the least disturbance. 
In closed cultures, however, where the plants were kept un- 
disturbed, the ripened spores remained on the hyphae for a 
long time. It was very rare to see the new spores produced 
at the ends of the newly extended hyphae proceeding from the 
tips of the old ones, as commonly observed in the Bermuda 
specimens. Instead of this process, the new crops of spores 
were produced here mostly as secondary spores on the surface 
of the ripened spores. They were produced at the ends of 
short hyphal branches, which were given out perpendicularly 
from different parts of the spores. Some of the spores pro- 
duced three, four, or even more secondary spores on their 
surface at the same time. On these secondary spores another 
crop of similar spores was rarely observed while the whole 
arrangement was still borne on the tip of the hypha. 
Another mode of spore-formation, which was far less com- 
mon than that described above, was one where a new spore 
was produced on the tip of a fertile hypha by the side of an 
old spore, which was shifted a little to one side. Here the 
abstriction of the sprouting hypha took place very close to 
the surface of the swollen basidium, resembling somewhat the 
