Fresh-water Alga. 65 



Little Namaqualand. In wet mud on banks of dam at Pella ; 

 8.1.09. 



9. Chroococcus minor, (Kiitz.) Nag. 



Karoo. In spring smelling strongly of sulphuretted hydrogen at 

 Gansfontein ; 2.12.08. 



Little Namaqualand. In dam at Pella ; 8.1.09. 



Great Namaqualand. In spring at Warmbad ; 28.1.09. Temp, of 

 water 35° C. 



Forma minima, West, in Journ. Linn. Soc. bot. 1894, p. 275, t. 16, 

 f. 18. Chr. minutus var. minimus, von Keissler, in Verhandl. der 

 Zool. bot. Ges. Wien, 1901, p. 394, f. 1, 2. Chr. minimus, (v. Keissl.) 

 Lemm., in Archiv. fur Botan. utgifv. af K. Sv. Vet.-Akad. Bd. 2, 

 No. 2, 1904, p. 102. 



Upper (or Composite) Eegion. Holle River; 10.12.08. 



Little Namaqualand. In dam at Kamiebies ; 24.12.08. Dabain- 

 oris ; 11.1.09. In dam at Pella ; 8.1.09. 



10. Chroococcus minutus, (Kiitz.) Nag. 



Great Namaqualand. In spring smelling strongly of sulphuretted 

 hydrogen at Warmbad; 28.1.09. 



11. Chroococcus varius, A. Br. 



Angola. Attached to the sides of a shallow concreted water- 

 conduit at Mossamedes. 



12. Chroococcus pallidas, Nag. 



Little Namaqualand. In dam at Pella; 8.1.09. 



13. Chroococcus turtjidus, (Kiitz.) Nag. 



Upper (or Composite) Region. On drying mud, Holle River ; 

 10.12.08. 



Little Namaqualand. In dam at Pella; 8.1.09. In spring at 

 Henkriesfontein ; 14.1.09. 



Cape Region between Ceres and Karoopoort. In a spring smelling 

 strongly of sulphuretted hydrogen at Leeuwefontein. 



Family CHAMiESIPHONIACE^E. 



14. Chamcesiphon incrustans, Grun. 



Angola. On Bhizocloniuvi hieroglyphicum in Cazengo District. 



15. Chamcesiphon gracilis, Rabenh. 



Long. 30-46^; lat. cell. 2-24 ,<, cum vag. 3-2-3-8^. 

 Angola. With the preceding species, but epiphytic on Vaucheria 

 sp. (sterile). 



