ho 
Nr. 2. L. KOLDERUP ROSENVINGE: 
vegetative cell-rows, not at the end of particular carpo- 
gonial filaments lateral on the latter, as in other Florideæ, 
and they are always included, not with protruding end. 
It must therefore be concluded that they cannot be con- 
sidered as more or less modified carpogonial cells. They 
might better be compared with the sterile hairs occurring 
near the carpogonial branches in Ptilota (comp. Davis, 
Bot. Gazette, 22, 1896). They are doubtless reduced organs 
without function, not giving rise to any new formation. 
2) The other kind of particular cells, the generative 
cells, as they have been named above, are, in contra- 
distinction to the flask-shaped cells, productive. They arise 
at the top of the primary nemathecial filaments, by trans- 
formation of the end-cell or as a lateral outgrowth, they 
are rich in protoplasm and divide early with the conse- 
quence that they form small groups of active cells at the 
surface of the young nemathecium. From these cell-groups 
new cell-rows spring in a horizontal direction or directed 
upwards, with the result that numerous upward growing 
cell-rows are produced, forming a system of secondary 
nemathecial filaments issuing from an irregular layer situ- 
ated near the bottom of the nemathecium. The cells of 
this layer are irregular of shape. The nemathecium is thus 
built up in two distinct phases. The primary nemathecium 
is a rather low cushion composed of closely placed pri- 
mary nemathecial filaments of moderate length, being im- 
mediate continuations of the cortical cell-rows; at the border 
the cell-rows are shorter and diverging outwards. By the 
further development of the nemathecium the upper portion 
arises, exclusively or mainly, from the generative cells, or 
their derivates, and the secondary nemathecial filaments are, 
therefore, not continuations of the primary ones. The whole 
