Nr. 1] SUBAERIAL ALGAE FROM SOUTH AFRICA 13 



divisions of the contents of the mother cell, and which are 

 liberated by the mplure of the old mother wall. The length of the 

 ceils of Phaseolaria obliqua nov. spec. usually is 8—10 jn, only as 

 a rare exception up to 12 u long, and }4 — % as broad. Further, it 

 is very conspiciious in this species that the poles of the cells are not 

 uniform, one end being distinctly broader and more obtusely 

 rounded than the other. 



This species is apparently very rare, as I have found it 

 in two samples only, viz. on the bark of a tree-trunk col- 

 lected near the Signal Station at Bluff, at the entrance of the 

 harbour of Durban, Oct. 28tli 1912, and on the bark of a tree near 

 Umbilo River, Nov. 12tli. On the trunks it forms a light-green 

 incrustation, where the cells are aggregated to large congeries. Fig. 

 78, pi. I, shows a little of such congeries, where the cells are lying 

 orientated in all directions possible. The contents are only drawn 

 in one cell formmg zoospores. The rest of the figures 52 — 77 show 

 the cells or the membranes of the cells seen from the side, fig. 52 

 and 57 are cells seen from two different sides. 



Under the name of Protococciis variabilis (Chlorococcum varia- 

 bile (Hansg.) — in Physiol. u. Algol. Stud. T. 4, Prodrom. I, 

 pag. 142, fig. 88 — is described a small alga, which in the shape of 

 the cells much resembles Phaseolaria obliqua. An examination of 

 Hansgirg's authentic specimens from Prag in Wittrock et 

 NoRDSTEDT, Algæ Exsiccatæ, Fase. 23, no. 1091, however, has 

 distinctly shown that these two are different. Thus, it may be 

 menlioned as two dislinguishing features that the species of 

 Hansgirg has considorably larger cells, nearly twice as long, 

 which are quite uniform at both poles. It shows, however, in so far 

 a close conformity to the features that are particularly charac- 

 leristic of the genus Phaseolaria, especially in the shape of the cells, 

 that I refer it to this genus as a second species, Phaseolaria variabilis 

 (Hansg.) Printz. This one is also so distinct from all other 

 species of Chlorococcum Fries — a genus for the rest so well defined 

 and to which most of the earlier species, described as Protococcus, 

 are referred — that also Brunnthaler in his revision of this genus 

 in Pascher's Algenflora, p. (54, says: «Zugeh6rigkeit zu Chloro- 

 coccum sehr zweifelhaft». Within the genus Phaseolaria it may, 

 however, be given a very natural place. 



Myrmecia nov. gen. 



Cellulae snbglobosae-ovales, subirregulares, solitarie et libere 

 viventes. Membrana achroa, crassiuscula et latere uno in verrucam 

 humilem, latam incrassata. Chromatophorum campanulatum, 

 viride, parietale, totum fere parietem cellulae obtegens vel uno latere 

 incisum. Pijrenoidibus nullis. Nucleus pro ratione magnus, cen- 

 tralis. Propagatio zoosporis contentu cellulae maternae diviso suc- 



