10 HENRIK PRINTZ ; [1920 
The characteristic feature of this species is above all its distinetly 
and coarsely verrucous membrane. There is no usual crenulation of 
the membrane, but it is more or less densely beset with rather 
coarse, subobtuse waris. It is frequently seen that one side of the 
colonies may be more or less smooth, e. g. pl. I, fig. 18, 21, 22, 25, 
26. This is due to the fact that the colony on the smooth or less 
verrucous side has been recently detached from a larger colony. 
The prominences thus grow out only from the free surfaces of the 
cells. The cells are more or less globular, or by mutual compression 
somewhat angular, generally with a diameter of 5,5—7 pu, some- 
times, just before the division, up to 8—9 u. Mostly colonies of 
2—4 or 8 cells occur; larger colonies are more rare, as they are easily 
detached. The membrane is rather thick, hyaline. The chromato- 
phore is bell-shaped, parietal, and occupies the whole of the inner 
wall. here is no pyrenoid. 
On account of its warty membrane, this species recalls 
HAnsGIRG's  Pleurococcus crenulatus (Prodrom. I, 1886, p. 133, 
fig. 82), but differs from it in having a much more coarsely warly 
(not crenulate) membrane, and in the shape of the cells. P. 
crenulatus HANnsG. is hardly any real Protococcus at all; according 
to De WitLpeman it is akinetes of Hormiscia crenulata (cfr. 
E. De Witpeman: Note sur IUlothrix crenulata Körz. in 
Compte-rendu de la séance du 4. décembre 1887 de la Société 
Røyale de Botanique Belgique). 
The species seems to be rare, as I have only found it in two 
samples (293, 294) from trunks of trees in the wood above Bluli. 
Chlorococcum vitiosum nov. spec. [PI1. I, Fig. 31—511. 
Cellulis globosis magnitudine multum variantibus, vulgo dia- 
metro 8—16 u, rarius usque ad 22 u, vel etiam usque ad pauca pm 
diametro decrescentibus. Membrana tenui, hyalina, glabra, tegu- 
mento mucoso nullo. Interdum cellulae et magnae et parvae mem- 
brana plus minusve distincte crenulata occurrunt. Chromatophoro 
viridi, parietali, fere hemigloboso et dimidium fere parietem interio- 
rem cellulae obtegente. Pyrenoidibus nullis. Nucleo centrali 
singulo. Zoosporis numero valde variabilibus usque ad numerosis- 
simas in cellulis singulis ortis, membrana materna dirupta liberis. 
Zoosporis ovatis, 2—3 u longis, chromatophoro unilaterali, parietali 
instructtis. 
This species is one of the commaonest aérophilous algae in the 
samples collected. I have met with it in several of the samples from 
the environs of Durban as well as from Saldanha Bay. From other 
species of the genus GChlorococcum this especially differs in its 
chromatophore, which is hemispherical, covering only about one 
half of the inner cell-wall, whereby the other half of the cell gets 
colourless. In the material I have had for examination, the chro- 
