524 Annals of the Smith African Museum. 



(0) CLADOPHORACEAE. 



Genus EHIZOCLONIUM Kuetzing. 



1. Rhizoclonium hieroglyphicum (Kuetz.), Stockniayer, Ueb. d. 

 Algengatt. Rhizoclonium, Verh. k.k. Zool. Bot. Ges. Wien., xl, 1890. 

 p. 578 ; Kuetzing, Pliyc. germ., 1845, p. 206. 



Sample 47 (uncommon). 



Previously recorded by Wille from South Africa. 



Genus CLADOPHORA Kuetzing. 



1. Cladophora glomerata (L.), Kuetzing, Phyc. germ., 1845, p. 212. 

 Samples 29, 29a, 30a, 31, 33 (in all of these attached to Myrio- 



phyllum, etc.), 54 (?), 55 (?). 



2. Cladophora crispata (Roth), Kuetzing, Phyc. generalis, 1843, 

 p. 264. 



Sample 45 (forma ?). 



I do not feel certain of the specific determination of this form. The 

 material consisted of coarse, stout, main branches (diam. up to 150 ji), 

 with a thick stratified membrane. From many of these main branches 

 secondary ones, always definitely lateral, arose from the upper end of 

 every cell. These secondary branches were slender (diam. 22-27 fi), had 

 a relatively thin membrane, and were invariably more or less markedly 

 pointed. The majority of these secondary branches consisted of but 

 a single cell, but here and there longer ones were encountered, such 

 branches being very frequently curved. Ramification of the main 

 branches was not very common, and was either lateral or dichotomous. 



(7) SPHAEROPLEACEAE. 



Genus SPHAEROPLEA Agakuh. 



1. Sphaeroplea africana, n. sp. (Figs. 15, 16.) 



Fills vegetativis latis, inter cellulas plerumque evidenter constrictis, 

 cellulis valde elongatis, 6-18 plo longioribus quam latis, saepe plus 

 minus dolifonnibus, chromatophoris parvis et numerosis, in nnnulis 

 vel saepe irregulariter (raro spiraliter) dispositis, pyrenoidibus sparsis, 

 nucleis parvis numerosis, membrana longitudinali tenui, septis plus 

 minus inci'assatis, e processibus digitatis irregularibus introrsum 

 crescentibus constantibus. Oogonia cum oosphaeris sphaericis 

 numerosissimis varie dispositis, foraminibus paucis et parvis saepe 



