68 Veit Brecuer WirTrRock. 
reversedly egg-like shape with an abrupt base (pl. 1, fig. 18 s#), or they are formed 
without any swelling (or with an almost imperceptible one) of the mother cell, and 
have then the shape of a cone with a somewhat rounded point (pl. 1, fig..18 ste). 
The inclosed spores are of three kinds; either they have the common cask-shape, 
or’ they are cylindrical, or they have an irregular form. The cask-shaped spores 
are most frequent in the branches of the I:st degree, but rare in those of the 2:d 
(pl. 1, fig. 18). In the branches of the 3:rd degree and in the principal filament I 
have never found spores of this shape. Spores of a cylindrical form are more rare; 
they occur only in branches of the I:st and 2:d degree, and in the rhizoid. The 
spores of an irregular shape (pl. 1, fig. 18 sz) belong to the principal filament; 
they are very rare in the branches of the 1:st degree (pl. 1, fig. 18 sz). Twin 
spores are sometimes found, terminal as well as inclosed in the branches. Generally 
the lower of the twin spores is smaller than the upper, and cylindrical, whilst the 
upper is swollen (pl. 1, fig. 19); but sometimes both are of about the same size, 
and swollen (pl. 1, fig. 20).—- Among all the specimens that I have had opportunity 
to observe, I have found but one (represented pl. 1, fig. 18) which has been so 
complete as to have the oldest part remaining, brought forth immediately by the 
germinating spore. This specimen does not show a distinct rhizoid, diametrically 
opposed to the cauloid. The spore has, in germinating, only grown somewhat 
pointed downwards. But it has, on one of its sides, developed a branch, which has 
at a later period ramified and taken its most considerable growth in a downward 
direction (pl. 1, fig. 18 rh), showing thus an evident relationship to a normal 
rhizoid part. 
Sterile specimens. Of these I have seen only one, and that one was 
not quite entire. As to ramification and dimensions it resembled the strongest 
developed fertile ones. Besides three and three, the branches were also found four 
and four in a whorl on the principal filament. 
Measurements. Fertile specimens. Cauloid part. The vegetative cells 
of the principal filament are midways on an ay. 165 w thick. Most frequently they 
are narrower in their lower end and grow thicker upwards. The smallest diameter 
I have found is 135 uw, and the greatest 190 w. The vegetative cells of the branches 
of the i:st degree are on an ay. 111 w thick; the limits of variation are 90 and 
140 w. The branches of the 2:d degree vary in thickness between 90 and 100 u, 
those of the 3:rd degree between 80 and 90 w. The length of the vegetative cells 
is not very considerable in this species, generally 6—11 times as great as the 
thickness. Longer cells are rare, but shorter, on the contrary, more frequent. Parti- 
cularly the top cells and the cells just below the top spores are not seldom so 
short as to be only twice or thrice as long as thick. The swollen top spores are 
on an ay. 150 w thick and 212 w long. The limits of variation are ' {?) and 3% w. 
The sizes between are for instance ‘ [7 3%) 33) wu. Those top spores that are not 
swollen are considerably more slender, but at the same time somewhat longer; on 
an av. 88 uw thick and 246 w long. They vary between *- 300, 162, 900 H The inclosed 
cask-shaped spores are on on an ay. ‘22 w. The limits of variation are indicated 
by the following: * 80 150 175 yw, The inclosed cylindrical spores are on an ay. 
1. 205, 275, 275 
th. 83 uw. The limits of variation lie between % % and 1° w. The irregularly shaped 
