On THE PITHOPHORACES. 51 
themselves are also branchless (I have seen but one or two exceptions from this 
rule), and besides these, a great deal of the common vegetative cells are without 
branches. I have even seen one specimen quite devoid of branches; it is repre- 
sented pl. 1, fig. 5. Short accessorial basal branches are not seldom found (pl. 1, 
fig. 4). I have seen no helicoids in this species. The vegetative cells are in 
general somewhat swollen or, if you like it better, contracted at the joints. The 
spores are in P. equalis nob. generally inclosed; of terminal ones I have only seen a 
few. In specimens of the first type of ramification the inclosed spores are placed 
exclusively in the branches of the I:st degree and not in the principal filament; 
but iv specimens of the 2:d, only in the principal filament and not in the branches. 
Of both types, however, I have seen one specimen with spores both in the prin- 
cipal filament and in the branches of the I:st degree. The inclosed spores are a 
little swollen, casklike, but slender, with the ends somewhat rounded (pl. 1, fig. 
4, 5). (One spore of cylindric form I have also observed.) They are always single; 
twin spores I have not observed. The terminal spores are also cask-shaped, but 
narrow, and grow tapering towards the top, which is rounded (pl. 1, fig. 5). 
The rhizoid part is in this species faintly developed. It generally consists 
not of a whole cell, but only of that part, pointing obliquely downwards, of the 
basal cell of the plant, which, in the germination, has developed in an opposite 
direction to the cauloid. This-part of the cell is always short; sometimes not 
much longer than the thickness (pl. 1, fig. 5 rh), but sometimes 3 or 4 times as 
long as. thick. Not rarely I have found specimens in which the base has been 
formed of a cell rounded at the lower end and sometimes also a little swollen at 
the same end (pl. 1, fig. 6 sqg?). If this cell has, as I suppose, developed imme- 
diately out of the germinating spore, the rhizoid part is here missing. In one or 
two specimens I have found a rhizoid consisting of one cell, of almost the same 
nature as in P. kewcnsis nob., and in one specimen I have found this organ formed 
by no less than three vegetative cells, but they were short and rather slender. 
Sterile specimens resemble the fertile essentially as to the ramification. 
They differ somewhat, the branches generally being stronger; and moreover the 
branches are found sometimes single, and sometimes two and two opposite to each 
other. j 
As in P> ki wens's nob. connecting forms are not rarely found between the 
sterile -and fértile specimens, that is, specimens that are at the lower end fertile and 
have few branches, and at the upper end sterile with many branches, or vice versa. 
‘Measurements. Fertile specimens. Cauloid part. The cells of the 
_ principal filamené are. on an av. 102 « thick. The limits of variation are 75 and 
120 uw. The cells of the branches of the 1:st degree are on an av. 83 w; they vary 
between 75 and’ 90 uw. The cells of the branches of the 2:d degree are on an av. 
67 « thick; they.can vary between 65 and 70 w. The length of the cells varies rather 
considerably; but..they are never very long. The shortest are only twice and the 
longest 20 times as long as thick. Generally they are 5 or 8 times as long as 
thick. The diameter of the inclosed spores is on an av. 111 w, and their length 250 u. 
The limits of variation are indicated by * ig? (33 32". The top spores are on an 
av. 98 w thick and 288 mw long. They vary between °° and 1 wu. 
tt 
