Fresh-water Algee. 89 



The specimens did not entirely agree in all details with the 

 description and figures of this species, as the vegetative cells were 

 a little thicker and the oogonia a trifle smaller. It is not necessary 

 to give these African plants a varietal name, as I think such differ- 

 ences as were apparent come well within the limits of variation for 

 a species of CEdogonium. Moreover, the dimensions of the vegetative 

 cells and oogonia are the same as in CE. iwoer&wm forma subclusum 

 Wittr., but the latter has the oogonia 2-4-seriate, whereas they were 

 solitary in the specimens from Great Namaqualand. 



150. CEdogonium Pringsheimii, Cramer; Wittr., 1870; Wittr. 

 Prodr. Monogr. CEdog., 1874, p. 33, t. 1, f. 16, 17. 



Forma membrana oosporarum crassa (5 /j) et nigro-brunnea. 

 Crass, cell, veget. ( ? ) 17-19 p ; altit. 2^-3^-plo major ; 

 „ oogon. 34-36 /x; „ 36-44 p; 



„ oospor. 28-30 ,»; „ 29-30 /x; 



„ cell, antherid. 12-15 A t ; „ 3-5-5^. (Figs. 51-53.) 

 Little Namaqualand. In dam at Kozynbosch ; 9.1.09. 

 This form may possibly be identical with the one known as " var. 

 Nordstedtii, Wittr., forma pachydermatosporum, (Nordst.) Hirn " 

 (Cfr. Hirn, Monogr. CEdog. 1900, p. 173, t. 27, f. 160). The wall 

 of the ripe oospore is very dark brown and attains a thickness of 

 5 a. The vegetative cells are, however, in exact agreement with the 

 type (crass. 17-19//). The antheridia sometimes consisted of as 

 many as 10 cells. 



151. CEdogonium Welwitschii, W. & G. S. West. 

 Crass, cell, veget. 26-29 p ; altit. 2-3-plo major ; 



,, oogon. 40-44 yu; ,, 36-44 p ; 

 ,, oospor. 37-43 /.t; ,, 30-36 jx. 

 Little Namaqualand. At Rozynbosch, with the preceding species. 



152. CEdogonium sp. (sterile). 



Crass, cell, veget. 16 p ; cells 4-6 times as long as broad. 

 Great Namaqualand. Floating in sulphureous spring at Warm- 

 bad; 28.1.09. Temp. 35° C. 



153. CEdogonium sp. (sterile). 



Crass, cell, veget. 21-23-5 p ; cells very short (1-1| times as long 

 as broad). 



Little Namaqualand. In pool at Aggenys ; 6.1.09. 



