540 Annals of the Smith African Museum. 



tative cells (crass., 18-21 // ; altit., 4-7 plo major) were markedly 

 capitellate and rather thick-walled. The oogonium was pear-shaped, 

 with a thick stratified wall, and opened by a broad slit about one- 

 quarter of the way from the apex. Owing to the dense contents, the 

 structure of the oogonium- wall could not be distinguished. The 

 dwarf-males were ovate, not obovate, and were provided with a small 

 apiculus. 



(Note. — Sterile, and consequently indeterminable, material of this 

 genus was encountered in many of the samples, viz. 4, 5, 14, 15, 17, 

 19, 21, 22, 23, 24, 34a, 35, 41, 44, 45, 46, 47, 48.) 



Genus BULBOCHAETE Agaroh. 



(Note. — Only sterile material of this genus was encountered, in 

 samples 10, 39, 53, and 54, in the last two cases epiphytic on Oedo- 

 gonium crassum.) 



(//) SIPHONALES. 

 (2) VAUCHERIACUAE. 



Genus VAUCHERIA De Candolle. 



1. Vaucheria geminata, Walz. ; Heering, Siisswasseralg. Schleswig- 

 Holsteins, etc., ii, Jahrb. d. Hamburg. Wiss. Anst.. xxiv, 1906, p. 154. 



fig. 79. 



Sample 5 (fertile). 



(/) CONJUGATAE. 

 (1) MESOTAENIACEAE. 



Genus MESOTAENIUM Naegeli. 



1. Mesotaenium chlamydosporum, De Bary, Unters. ueb. d. Fam. d. 

 Conjugates 1858, p. 75, Tab. VII, 1); W. & G. S. West, Monogr. of 

 the Brit, Desm., Ray Soc, i, 1904, p. 52, PI. IV, tigs. 4-14. 



Sample 1<>. 



Already recorded by Reinsch from the summit of Table Mountain. 



