506 Annals of the South African Museum. 



(6) OOCYSTACEAE. 



Genus OOCYSTIS Naegeli. 



1. Oocystis solitaria, Witt rock, in Wittr. et Nordst., Alg. exsicc, 

 No. 244, Bot. Notiser, 1879, p. 27; Print/., Uebers. ueb. d. Gatt. 

 Oocystis, Nyt. Mag. f. Naturvidenskab., li, 1913, p. 183, Tab. V, 

 figs. 36-39. ' 



Samples 29, 29a, 30, 30a, 31, 33, 39 (rare in the last). 

 Long, cell., 19-34 //. ; lat. cell., 11-20 //.. Except in sample 39, very 

 few colonies were observed. 



2. Oocystis rupestris, Kirchner, Beitr. z. Algenfl. v. Wuertem- 

 berg, p. 169, Tab. II, fig-. 2; Print/., op. cit., p. 174, Tab. IV, 

 figs. 7-9. 



Sample 44 (common). 



Long, cell., 11-25 /i ; lat. cell., 6-12 /*. 



3. Oocystis naegelii, A. Braun, Alg. unieell., etc.. 1855, p. 94 ; 

 Printz, op. cit., p. 178, Tab. V, fig. 64. 



Sample 39 (rare). 



(7) SC E N EDES M A CE A E. 



Genus SCENEDESMPS Meyen. 



1. Scenedesmus obliquus (Turp.), Kuetzing, Syn. Diat., Linnaea, 

 viii, 1833, p. 609 ; Brunnthaler, Syst. Pebers. ueb. d. Chloroph. 

 Gatt, Scenedesmus, Meyen, Hedwigia, liii, p. 165, fig. 1 (Syn.: S. 

 acutus, Meyen). 



Samples 34, 39. 



Var. dimorphus, Rabenhorst, Flor. Europ. Alg., etc., iii, 1868, 

 p. 64 (Fig. 7, c-d). 



Samples 4, 14, 15, 48. 



Previously recorded from South Africa by Wille and by G. S. West 

 from Gansfontein, Ceres Division. 



For comments on the relation between this form and 8. acuminatus 

 (Lagerh.), Chodat, see under the latter species. In sample 34 there 

 occiu'red the form known as Dactylocurcus infusionum, Naegeli, which 

 is now almost generally regarded as a stage of S. obliquus. 



2. Scenedesmus acuminatus (Lagerh.), Chodat, Algues vertes, etc., 

 1902, p. 211. Fig. 88. (Syn.: S.falcatus, Chodat, Nuova Notarisia, 

 1895, p. 89; Selenastrum acuminatum, Lagerheim, Ofvers. K. Wt.- 

 Akad. Foerhandl., 1882, No. 2, p. 71. Tab. Ill, figs. 27-30). (Fig. 7. a ). 



