2 
Kingo Miyabe . — On the Life-history of 
millimeters. The average length, however, at which the first 
crop of the conidial spores was formed, was about seventy- 
five. The diameter of the hyphae at their central portion was 
five to six micromillimeters. They were generally somewhat 
swollen at their bases. The swelling was more constant and 
striking at their free ends, where the spores were borne (Fig. 
i c). These spore-bearing cells were always deeper brown in 
colour than the rest of the hyphae, and their walls were greatly 
thickened all around their lateral sides in the form of a band. 
But the wall of their terminal portions remained always thinner 
in texture and lighter in colour. It was often^ observed, there- 
fore, that in some of the older hyphae which had ceased to 
grow after having shed their spores, their terminal walls col- 
lapsed and gave to the cells a characteristic cup-shaped form 
(Fig. i e). In those which were probably more favourably 
situated, and abundantly supplied with nourishment, a new 
growth of hyphae was seen to have taken place from the very 
spot where the spore had once been borne (Fig. i d). But 
a far more common form to be met with in the Bermuda 
specimens was one where a new growth took its origin, not 
from the swollen cell, but from the cell next below (Fig. 3). 
This new hypha grew right through the middle of the former, 
piercing the wall at its tip, and stopped in growth in most of 
the cases when two or three septa had been formed. At its 
free end a new spore was produced. This process could be 
seen to be repeated several times on a single hypha. 
It was not uncommon to see a branch formed also on the 
upper part of the swollen cell. But in general the branches 
arose from any of the cells of the primary fertile hypha. 
The place of their formation on a cell appeared not to be con- 
stantly fixed. In some it was produced just below a septum, 
while in others at about a middle portion of the cell. The 
branch was usually short, and was given off at an obtuse angle ; 
and on its end a spore was formed. 
The spores varied greatly in form and size. In form, they 
ranged from oblong-obovate to depressed-rotundate, always 
rounded at both ends. They were furnished with three prin- 
