Nr. Il SUBAÉRIAL ALGAE FROM SOUTH AFRICA 



Chiorophyceae. 



Protococcus consociatus nov. spec. [PI. I, Fig. 1 — 17]. 



Cellulis minimis, vulgo 2,5 — 3,5 jn diametro, in colonias niaximas 

 consociatis. Cellulis solitariis vel coloniis minus quam 4 — 8 cellulas 

 continentibus raris. Colonia 32 cellularum plus minusve 14 u dia- 

 metro est. Cellulae divisae diu cohaerentes. unde coloniae magnae 

 32 — 64 — 128 vel etiam plurium cellularum oriuntur. Cellulis cubicc 

 rotundatis, membrana tenui, glabra, colore rubello vel subaureo. 

 Chromatophoro parietali, campanulato, totum parietem interiorem 

 obtegente, nullas partes vacuas, achroas relinquente. Pijrenoidibus 

 nullis. 



This alga much recalls Protococcus viridis Ad. and Protococcus 

 Kiitzingii G. S. West, but differs from both species mentioned 

 iii generally having smaller cells, usually forming much larger, 

 coherent colonies. Generally colonies occur thai are composed oi 

 32 or 64 cells, or of a still greater number, up lo about 300 cells. 

 Colonies of 4 — 8 cells also occur, while single cells or bicellular colo- 

 nies, which are ralher frequenl in Pr. viridis, are very rare here. In 

 large colonies the individual cells by mutual compressicm gel more or 

 less angular, sometimes also ralher irregular. The annexed illustra- 

 tions (pi. I, fig. 1 — 17), for the rest, will give an idea of Ihe shape 

 and arrangement of the cells and colonies. The cell-wall is thin 

 and smooth; somelLmes il seems to be slighlly crenulale. 



A most distmclive feature of the species is also thai the 

 membrane has a slightly reddish or golden tint. The chromalo- 

 phore is bell-shaped, parielal, covering the whole inner wall of the 

 cell, withoul leaving any open or colourless part; il is wilhout a 

 pyrenoid. The diameter of the cells usually is 2,5 — 3,5 ju, only 

 immediately before the division at limes somewhat larger, up lo 

 about 4 jLi. The diameter of a 32-celled colony is ± 14 u and of a 4- 

 (or 8-) celled colony on an average 7—8,5 u. 



This species I have found to be very common in quile a numljer 

 of samples of bark collected in the woods above Bluff (Durban), 

 along the cross-road to the South African Whaling Co.'s station, and 

 towards Isipingo kraales, in the days November 13tli to 17tli, 1912. 



The species occurs in the foUowing samples: 98, 112, 121, 125. 

 126, 128, 179, 222, 246, 251, 252, 260, 280, 294. 



Protococcus verrucosus nov. spec. [PI. I, Fig. 18 — 301. 

 Cellulis 5 — 9 ju, vulgo 5,5 — 7 diametro, subglobosis vel angulari- 

 globosis, plerumque 2 — 4 — 8 in colonias consociatis. Membrana 

 crassiuscula, achroa, distincte verrucosa. Chromatophoris singulis, 

 magnis, parietalibus et homogeneis, pijrenoide carentibus. 



