76 Veit BrecHer WITTROCK. 
Figs. 18 to 20. P. Roettleri (Roth) nob. 
Fig. 18. The lower half of a fertile specimen, without any normal rhizoid, but 
with a lateral branch from the mother spore of the plant. A branch carries a 
helicoid, h. 
» 19. A piece of a branch of the 1:st degree with an inclosed pair of twin 
spores s' s’. 
» 20. The top of a branch of the l:st degree with a terminal pair of twin spores. 
PUADE ie 
The figures are magnified 20 times, with the exception of figs. 
10 to 12, which are magnified 50 times. 
Figs. 1 to 12. Pithophora kewensis nob. 
Fig. 1. An almost complete specimen with a rhizoid consisting of one cell and a 
fertile cauloid with long branches. 
» 2. Two connected prolific cells, p and yp’, which have developed a specimen 
each. Of the one developed from p only the lower part is visible. Of the 
one developed from p’ the whole is visible. 
» 3. Two connected prolific cells, » and p’, which have developed one specimen 
each laterally. The one developed from p is richly ramified, but the one from 
p is unbranched. The prolific cell p has also developed, apically, a cell 
which has afterwards formed a spore, st, in its top. 
» 4. The middle part of a fertile cauloid with numerous but scantily developed 
branches. 
» 5. Complete specimen with a rhizoid of one cell, rh, and an almost unbranched, 
fertile cauloid. The specimen very plainly shows the basipetal direction, in 
which the formation of spores regularly takes place. / 
» 6. Complete specimen with a rhizoid of one cell, rh, and a cauloid of which 
the lower part is sterile and the upper fertile. 
» 7. Complete specimen with an unusually long rhizoid of one cell, rh, and a 
cauloid of which the lower part is fertile and the upper sterile. The lowest 
subsporal cell of the cauloid has sent forth a subsporal branch, bs. The spe- 
cimen has been broken off at X. From the uppermost cell left, the abnor- 
mally short topcell, ct, of the principal filament has afterwards been developed. 
(This specimen and the one represented fig. 6 belong to the so-called half- 
fertile-half-sterile). 
» 8. Uppermost part of the principal filament in a sterile specimen. The cell- 
contents are not represented. 
» 9. A piece of a sterile specimen, with an accessorial basal (rhizine) branch, 
ac, in the act of being formed. 
» 10. A piece of a sterile specimen, of which the cells have partly been attacked 
by parasitical protozoa. The protoplasm in the middle of the cell of the prin- 
cipal filament is consumed by the parasites, but the protoplasm left in each of 
the two ends of the cell has individualized itself to an indepedent cell, after 
having limited itself towards the space occupied by the parasites by a new 
transversal cell-wall. The protoplasm in the uppermost part of the branch-cell 
has proceeded in the same manner. 
