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At right angles to the hypha the primordium of the falx grows<br />
out to its full length, to begin with as a long, almost cylindrical<br />
cello Soon the primordium of the prophialide appears as a swollen<br />
part of the cell, and above this swollen part the primordium of the<br />
narrow apical filament is to be seen (Fig. 1 c). Thus, this appar<br />
ently not important apical cell is formed very early in the develop<br />
ment of the falx (is it a rudimentary organ ?). The basal wall of the<br />
prophialide is the first septum formed. After this first septation the<br />
phialides (Fig. 1 d and e) are formed and about at the same time<br />
IO I<br />
JO I<br />
Fig. 1. Zygospo-rium parasiticuan, Danish isolate 1941. a)-f). stages in<br />
the development of a faIx; f) a mature faIx with a conidium in side view,<br />
( i. e., at right angle, in the direction of the arrow, on the line A-B in<br />
fig. h); g) a mature faIx with conidia in front view; h) the same seen<br />
from above; i ) a falx with a secondary falx. Magn, X 1250 .
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