54 Veit BRecuer Wrrrrock. 
Rhizoid part. The rhizoid, parted from the cauloid by the oblique wall 
formed in the germination of the spore, consists in P. kiwensis nob. as a rule of 
one cell (pl. 2, fig. 1, 5, 6, 7 rh, pl. 4, fig. 4, 5 rh). Seldom it develops so as to 
have several (up to 12) cells (pl. 4, fig 6, 7). In this species I have not rarely 
met with spores in the rhizoid also. Pl. 4, fig. 9, 10 and 11 represent such spore- 
carrying rhizoids with different number of spores. In one case I have seen a rhizoid 
with fully developed branches, consisting, however, each of but one cell. This rhi- 
zoid is represented in pl. 4,.fig. 8. Very seldom it happens that the rhizoid is 
but rudimentary, being formed of only a very small process from the germinated 
spore, which process has not been parted from the basal cell of the cauloid by a 
cell-wall (pl. 1, fig. 8 rh, pl. 4, fig. 2, 3 rh). 
Sterile specimens generally have a stronger ramification than the fertile 
ones, The branches of the I:st degree are often formed two and two by the same 
mother cell and are then placed opposite, or almost so, to each other (pl. 1, fig. 8, 
lower part). Branches of the 2:d degree are not rare. The sterile specimens are 
also greater in size than the fertile; regarding this, see below in »Measurements.» 
Prolific cells (pl. 3, fig. 1 ») oecur in sterile specimens much oftener than in fer- 
tile ones. 
Measurements. Fertile specimens. The greatest of these, that I have 
seen, have had a length of 31/, centimeter; but generally the specimens are much 
shorter, 
Cauloid part of the thallus. The vegetative cells of the principal fila- 
ment are on an ay. 59 «w thick; the smallest observed thickness is 45 w and the 
greatest 80 «w. Vegetative cells in the branches of the l:st degree are on am ay. 
45 « thick; the limits of variation 38—51 mu. The cells in the branches of the 2:d 
degree are in general 40 « thick. The length of the vegetative cells varies very 
considerably. In general they are 12 to 20 times as long as thick, but you also 
find spore-carrying cells which are but little longer than the thickness; whilst cells, 
particularly terminal, have also been observed up to 30 or 40 times as long as 
thick. — The terminal spores are on an ‘av. 88 uw thick and 219 w long. The 
limits of variation are indicated by the following numbers: { ,f° 102 00 u. ‘The 
inclosed spores have averaging a thickness of 81 w-and a length of 205 w. They 
vary between ‘> % and 1° a. The bigger spores belong of course to the principal 
filament, and the smaller ones to the branches. The spore-membrane has in ripe 
spores a thickness of 3 to 5 «. 
Rhizoid part. Its végetative cell (or cells) is on an av. 42 w thick. It 
varies between 35 and 55 w. The length exceeds the thickness 4 up to 40 times. 
When spores occur in the rhizoid, they are on an ay. !/, narrower than those in 
the cauloid, but of about the same length. 
Sterile specimens. The dimensions are here generally somewhat larger. 
Specimens of a length of 6—7 centimeter are not rare, and those of 4—5 em. 
seem to be the most common ones. The cells of the principal filament are on an 
av. 80 w thick; they vary between 50 and 110 vw. The cells in the branches of 
the i:st degree are averaging 57 w in thickness. The limits of variation are 40 « 
and 85 uw. Branches of the 2:d degree are on an ay. 50 w thick. The length of 
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