56 Veit Brecuer Wirrrock. 
the branches of the 2:d degree, but also with those of the 3:rd (pl. 6, fig. 4). — 
The attaching. points of the branches on their supporting cells are the same as in 
P. kewensis nob. The length of that piece of the supporting cell which is situated 
above the attaching point of the branch is in general equal to the diameter of the 
branch. 
The subsporal cells are in this species uncommonly productive. Very often 
we find that a subsporal cell has brought forth one subsporal branch, and now 
and then it even happens that such a cell has formed two (opposite) branches (pl. 
6, fig. 5 bs). In one ease I have observed that a subsporal cell, whose mother- 
cell has brought forth not only one spore but a pair of spores, has still had so 
much living substance left that it has been able to form a subsporal branch, how- 
ever small; see pl. 6, fig. 4 bs?. Subsporal branches exist of all degrees, of the 
3:rd as well as of the L:st and 2:d (pl. 6, fig. 4 bs?, bs). -As to the direction of 
the subsporal branches in relation to their supporting cells (the subsporal cells), 
a deviation here takes place from what is the case with the common, not subsporal 
branches. The subsporal branches form, as a rule, a greater angle (of 50 and even 
90 degrees) against their supporting cells, than the common branches (the angle of 
these being, as in the other species of Pithophora, generally 45 degrees). The sub- 
sporal branches are also placed somewhat farther below the top of their supporting 
cells than the common branches. Neither are accessorial branches rare. They 
proceed from a point near the base of their mother cells (see pl. 6, fig 4 ac), thus 
being analogous to the cauloid rhizine branches so common in Cladophoree (compare 
parag. 5, page 36). 
In this species occurs a kind of branch formation which I have not observed in any 
other species of Pithophora. Real spores, brought forth in the normal manner and remain- 
ing attached to the mother specimen, do here sometimes form branches, instead of 
germinating in the common manner after having separated themselves from the 
mother plant. Pl. 6, fig. 6 shows the uppermost end of a specimen in which a 
number of spores have proceeded in this manner. We find there that the spores of 
this species can, as well as the common vegetative cells, form one or two branches 
each, and that the spore branches are formed from the side of the spores in a 
inmanner in all the principal points resembling that in which normal branches are 
formed from common vegetative cells. It is particularly remarkable that the spore 
branches proceed from the very midst of the spore, and especially that the branches 
have a position relative to the longitudinal axis of the spore which differs from 
that which common normal branches have to their supporting cells. Instead 
of forming an angle of only 45 degrees against the upper part of the supporting 
cell (here the spore), they form an angle which is much greater, sometimes even 
more than twice as great; see pl. 6, fig. 6. A parting-wall’ between the spore - 
itself and its branch-process has not been formed in the specimen represented by 
this figure, but in other specimens I have observed one; see pl. 6, fig. 4 bsp. 
The spores are developed partly in the principal filament and partly in the 
branches of the ‘1:st and 2:d degree (pl. 6, figs. 38, 4). In the branches of the 3:1d 
degree I have never observed spores. Both the terminal cells and the inclosed 
develop spores. The inclosed spores are almost purely cask-shaped; the terminal 
