The Freshwater Algae of Africa. 



557 



17. Cosmariitm pseudobroomei, Wolle ; W. & G. S. West, op. cit., iv, 



1912, p. 22, PL C, tigs. 7, 8, and PL GUI, tig. 7. 



Forma ad var. convexum, W. >V G. S. West accedens, sed fere tarn 

 longum quam latum. Long., 37-40 ft ; Lit.. 36 39 fx ; Lit. isthm, 11 /x. 



Sample 24. 



This form resembles tlie type more nearly in its dimensions, but the 

 lateral margins are pronouncedly convex and the apex is slightly 

 convex. The granules are arranged in evident vertical series. 



a 



l 



I- c 



Fig. 2!t. — Cosmamum subbr nei, Schmidle, format". </. Forma typica, 



front-view, b and d. Forma pseudo-quadrum, front-views, c. Forma 

 pseudo-conspersum, front-view ; e. e', >". divei'se end-views, the appro- 

 priate specimens to which they belong being indicated by interrupted 

 lines. /. Individual in side-view. The complete granulation is only 

 shown in Fit^. ". All figures x 1000. 



18. Gosmarium subbroomei, Schmidle, Beitr. z. Algenfl. d. Schwarz- 

 wald. ii. Rheineb., Ber. naturf. Ges. Freiburg i. B., vii, 1893, p. 104, 

 Tab. V, tigs. 22 24; W. & G. S. West. op. cit, iv, 1912, p. 23, PL G. 

 figs. 10, 11. 



Formae diversae, pro parte ad C. quadrum, Lund., et G. conspersum, 

 Kail's accedens i Fig. 29). 



Samples 34a, 35, 48. 



The reference of the specimens in the above samples to G. sub*> 

 broomei, Schmidle, is based solely on the end-view and the character 

 of the granulation. As far as the shape in front-view of these speci- 

 mens is concerned, they might l>e referred to G. '/lit/drum, Lund., 

 C. conspersum, Ralfs, or even to ('. margaritatum I Lund.), Roy & Biss., 

 since individuals showing the shape characteristic of these species, on 



