Nr. 1] SUBAERIAL ALGAE FROM SOUTH AFRICA 39 



cells, where the opening of the chromatophore may 

 be seen. The niembranes are smooth or partly 

 crenulate. 

 Fig. 105—123. Myrmecia (jlobosa 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 emplied. 



PI. III. 



Fig. 124—155. Pleurastrum constipatiim 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. 138—150, 152— 

 155 showing formation of akinetes. 



PL IV. 



Fig. 156 — 199. Pleurastrum lobatum (Chodat) 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 oell 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. 



PI. V. 



Fig. 201—220. Trentepohlia lagenifera ^^(Hilde^r.) Wille var. 

 africana nov. var. 



Irregular filaments partly with gametangies. Fig. 

 211 shows an isolatecl gametangium wun gametes. 

 Fig. 212, emptied gametangium. 



PI. VI. 



Fig. 221—228. Trentepohlia lagenifera (Hildebr.) Wille var. afri- 

 cana nov. var. 



Vegetative cells, partly v.itli gametangies. Fig. 228, a 

 single isolated cell (akinete?). 



Fig. 229 — 232. ? Trentepohlia elUpsiocarpa Schmidle var. africana 



SCHMIDLE. 



Filaments, with various stages of formation of 

 gametangies. Fig. 231, opened gametangium. Fig. 

 232, filament with a short branch. 



