574 



Annals of the South African Museum. 



striction was quite evident and the limits of each cell were plainly 

 discernible. (Fig. 35, c.) 



The threads were twisted in various ways (Fig. 35, a, d), not 

 uncommonly looping round those of the Uivularia, and were never 

 straight for any considerable distance. A very marked feature was 

 the almost constant deflection of the apex of the filament (Fig. 35, a, e), 

 and in many cases this was accompanied by a slight attenuation. 

 (Fig. 35, e.) 



It seems possible that the Oscillatoria subtilissima of Kuetzing 

 (Spec. Alg., p. 2:38) which (lomont (op. cit , p. 240) places among the 



Fig. 35. — Lyngbya rivulariarum, Gomont, forma, x 750. 



" species inquirendae," may be a form of this Lyngbya. The sheath. 

 at least in my material, would be so readily overlooked that the form 

 might easily be referred to Oscillatoria, and the remaining characters 

 are not opposed to this view. 



4. Lyngbya kuetzingii, Schmidle, Algol. Not., iv, Allgem. bot. 

 Zeitschr., 1896, p. 58 ; Forti, op. cit., p. 280. 



Var. distincta (Nordst.), Lemmermann, Algenrl. d. Sandwich- 

 Inseln, Engler's Bot, Jahrb., xxxiv, 1905, p. 620 (Syn. : L. subtilis, W. 

 West ; L. distincta. Schmidle). 



Sample 5. 



Diam. fil., T3/x. I follow G. S. West (Eep. Freshw. Alg. Third 

 Tanganyika Exp., Journ. Linn. Soc, Bot., xxxviii, 1907, p. 174) in 

 accepting the above synonymy; if the latter is correct, the var. 

 distincta is evidently variable in two respects, viz. length of cell and 

 nature of the cell-contents. In W. West's original diagnosis (Alg. 



