SUBAERIAL ALGAE FROM SOUTH AFRICA 59 
Fig. 105—123. 
Fig. 124—155. 
Fig. 156—199. 
Fig. 221—2928. 
Vig. 229—232. 
cells, where the opening of the chromatophore may 
be seen. The membranes are smooth or partly 
erenulate. 
Myrmecia globosa nov. spec. 
Fig. 112—123, ordinary vegetative cells of different 
size. Fig. 117, 118, and 121 show that the opening 
of the chromatophore is on the opposite side of the 
membrane-wart. Fig. 119, 110, 111, 105, and 106, 
advancing stages in zoospore-formation. Fig. 107, 
108, and 109, zoosporangies, partly or wholly emptied. 
PI. HI. 
Pleurastrum constipatum nov. spec. 
Fig. 124—137, and 151 represent larger and smaller 
thalli, showing their shape and size. The contents of 
the cells drawn in fig. 151 only. Fig. 188—150, 152— 
155 showing formation of akinetes. 
Pi. IV. 
Pleurastrum lobatum (CuHopatT) PrinTz nov. comb. 
Larger and smaller colonies. Contents drawn in 
a few cells only. Fig. 159 and 160 are cells containing 
zoospores. Fig. 164 is a solitary cell in zoospore- 
formation. Fig. 196—197 and 198—199 are two colo- 
nies seen respectively from the face and from the 
side, showing that the cells are orientated in one 
plane only. 
PE V. 
. Trentepohlia lagenifera (HitDEBR.) WILLE var. 
africana nov. var. 
Irregular filaments partly with gametangies. Fig. 
211 shows an isolated gametangium wiuin gametes. 
Fig. 212, emptied gametangium. 
PI. VI. 
Trentepohlia lagenifera (HitpeBr.) Witce var. afri- 
cand nov. var. 
Vegetative cells, partly with gametangies. Fig. 228, a 
single isolated cell (akinete?). 
? Trentepohlia ellipsiocarpa ScumibpLE var. africana 
SCHMIDLE. 
Filaments, with various stages of formation of 
gametangies. Fig. 231, opened gametangium. Fig. 
232, filament with a short branch. 
