Nr. 1] 
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SUBAERIAL ALGAE FROM SOUTH AFRICA 1 
metabolism, the real nature of which I have had no opportunity to 
examine, however. With regard to the chromatophore, it is further 
to be moticed that the colourless incision as a rule is situated in 
the side of the cell opposite the membrane wart. 
The nucleus is comparatively large and nearly centrally located, 
but it is not visible except after treatment with the special tests and 
colouring matter. By succedaneous divisions of the contents of the 
cells a varying number of zoospores arise. Whether these cell- 
diivisions are always perfectly regular, I dare not decide with 
absolute certainty; however, the first division m all the rather 
numerous specimens I have observed, seems to be orientated nearly 
perpendicularly on the membrane-inspissation (vide fig. 119, på. 
IT). The zoospores are nearly ovoid, + 3 u long. The material I 
have had at my disposal has been too badly preserved to be suitable 
for investigations on the cilies. The zoospores escape singly through 
an opening in the mother membrane. 
This alga occurs sparsely in some of the samples from the 
environs of Durban, frequently together with Pleurastrum con- 
stipatum (16, 52, 85, 302). 
Acanthococcus granulatus RrinscH var. aerophilus nov. var. 
[PI II, Fig. 79—891. 
Differt membrana crassiuscula, aculeis imparibus, crassis, 
cuneatis, irregulariter dispositis, instructa. Gellula diametro 3—30 u, 
vulgo 10—20 mu lata. 
This alga I have found to be common in quite å number of 
samples from the environs of Durban, but I have not observed it in 
a single sample from Saldanha Bay. It is very varying as to the 
size of the cells, the thickness of the membrane, as well ass in the 
shape and distribution of the prominences. However, the specimens 
observed by me hardly comprise more than a single species, but with 
a considerable range of variation. The decided aérophilous algae 
are hardly identical with the species living in freshwater, but as the 
specimens found by me, as to the shape of their cells, much recall 
A. granulatus, I have founded the alga in question as å variety 
of this one. 
The cells are spherical, at times somewhat irregular, usually 
10—20 up, rarely reaching a size of about 30 ps in diameter, enelosed 
by a homogenous, colourless membrane, up to 4 u thick. The pro- 
jections are usually coarse, rather short and thick, with bluntish 
tops; specimens with more pointed projections oceur, however; at 
times they are also shorter and more stubby, to almost hemispheri- 
cal. The projections are rather distant, irregularly distributed on the 
surface of the cell, and rather varying on one and the same cell 
both as to size and shape. Sometimes the projections or warts are 
seen to be somewhat reduced on one side, which, no doubt, is due 
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