The Reproduction of Ahnfeltia plicata. 13 
these groups of cells, in particular of those situated at the 
lowermost level of the nemathecia (figs. 6, 8, 9), is the 
same as that of the “Senker”. 
The marginal portion of the nemathecium is composed 
of horizontal cell-rows not connected with the cortex; these 
cell-rows have probably all taken their origin from the 
generative cells or their derivates, like those shown in fig. 
Le 
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Fig. 10. Vertical section of nemathecium, near the border, December. 
610,213 
7A, and they must therefore be considered as secondary 
nemathecial filaments. 
The development of the primary nemathecial filaments 
is, at all events to a great extent, stopped by the form- 
ations of the flask-shaped cells and the appearance and 
further development of the just described generative cells, 
and they are then replaced by the secondary nemathecial 
filaments produced by the latter. This arresting seems 
not only to be caused by the fact that the uppermost 
cells of the filament have developed into flask-shaped 
cells or generative cells, for the growth of other filaments 
also seems to be checked without producing generative 
cells. On the other hand, primary filaments seem in 
