22 Veit Brecuer Wirrrock. 
Pl. 4, fig. 18 shows a specimen of P. Roettleri Roth) nob. which 
has no normal rhizoid, but which has sent forth, from the mother spore, 
sg, of the plant, a side branch, which is itself ramified, sending a strong 
branch downwards and a feebler one upwards. That this side branch 
has been formed already in the germination of the spore seems to me 
very probable. The germinated spore would thus in this case have sent 
forth two processes, one from one of its ends, but the other not from 
its opposite end, but from one of its sides, and would thus have ger- 
minated in quite a peculiar manner. 
In the account of the increase of the new plant, originated in the 
germination of the spore, we will first take into consideration the cauloid, 
and afterwards treat the rhizoid. In its first stage the cauloid consists, 
as is mentioned above, of only one cell, viz. one of those originated 
by the formation of the first transversal cell-wall in the germinated spore 
cell. This cell now increases apically, and after having attained a certain 
length it is divided into two daughter cells by a succedaneously formed 
transversal cell-wall, vertical against the longitudinal axis of the cell. 
The formation of this wall, as well as of all the transversal cell-walls 
formed in the bipartition of the vegetative cells, takes place exactly in 
the same manner as the formation of the transversal wall which appears, 
in the formation of spores, between the spore itself and the subsporal 
cell; see above page 13. The lower one of the two daughter cells formed 
in the bipartition of the first cauloid cell, which is somewhat widened at 
the base, but as to the rest of the common cylindrical form, no more 
increases in the same direction, nor is divided, till ramification — or, 
in fertile specimens, possibly also formation of spores, —_ takes 
place. The upper, on the contrary, which is cylindrical with a rounded 
top, elongates apically in the longitudinal direction of the mother cell 
till it has become about twice as long as the mother cell, and then in 
its turn divides into two daughter cells, the lower and shorter of these 
being purely cylindrical with abrupt ends, but the upper and longer 
being of the same form as the mother cell. The lower daughter cell 
now formed has the same nature as the lower of those formed in the 
first bipartition — that is, it no more increases in a longitudinal direction, 
nor is divided, except when branches or spores are to be formed — 
but the upper elongates apically and is divided into two cells, in the 
same manner as its mother cell. The two cells now formed proceed in 
the same manner as those formed by the preceding bipartition. Thus _ 
there are formed, anew, a lower cell devoid of the power of increasing 
