The Freshwater Algae of Africa. 575 



Lake Distr., Journ. Koy. Microscop. Soc, 1892, p. 29) of L. suit II is 

 he gives: " lat. fil., l*5-l'8ti" and " cytioplasmate pallide aerugineo 

 et homogeneo, articulis diametro duplo " ; subsequently (Freshw. 

 Alg*. W. Ind., Journ. Linn. Sue, Bot., xxx, 1894, p. 274) he gives: 

 " lat. til., 1*4 ft." Schmidle for his L. distincta stales (/or. cit., p. 58) : 

 " Faeden ea. 18 t<, dick. Zellen so breit als lang, oder etwas laenger 

 oder kuerzer, mit granuliertem blaugruenem Inhalt, oft sehr undeut- 

 lich." 



My specimens had homogeneous cell-contents and the individual 

 cells were by no means always easily visible. The cells were about 

 two times as long as broad. They thus corresponded most closely 

 with W. West's original form. 



Genus SCHIZOTHPJX Iyitetzing. 



1. Schizothrix polytrichoides, n. sp. (Fig. 36.) 



S. aquatica, solitaria, stratum non formans et calce non indurata ; 

 filis principalibus magnis, ceteris gradatim diminutis, omnibus 

 tortuosis et valde elongatis, parce ramosis ; vaginis amplis (in ramis 

 ultimis saepe arctis), primo firmis et incrassatis, plus minus fusces- 

 centibus, turn plus minus irregularibus et diffluentibus, hyalinis, semper 

 longissime attenuatis ; trichomatibus saepe laete aerugineis, per- 

 multis intra vaginam ramorum majorum (saepe in fasciculis 1-3 

 distinctis), 1-pluribus intra vaginam ramorum minorum, saepe plus 

 minus subparallelis, interdum inter se torquatis ; trichomatibus ad 

 dissepimenta non constrictis, apicibus attenuatis, acutis vel calyptra 

 conica munitis ; protoplasinate plus minus granuloso ; dissepimentis 

 saepe lineis granulorum obductis. 



Ci'ass. ram. major., 70-80 /x ; crass, ram. ult., 12—21 /x ; crass, trich., 

 3' 5-6 /x ; cell, v-1 o plo longior. quam lat. 



Sample 37. 



This species, which, owing to the coloration of the sheaths in the 

 younger parts, must be regarded as a true Schizothrix (Sect. Chromo- 

 svphon Gromont), differs from all those hitherto described in the verv 

 large number of trichomes contained within the sheath of the principal 

 branches. In some of the latter more than fifty trichomes ( Fig. 36, D) 

 can be counted, and, even in the smaller branches, they may be 

 numerous (15-20). In the main filaments the numerous triehomes 

 do not necessarily occur in a single bundle (as in Fig. 36, D) ; often, 

 there are several distinct bundles of trichomes, more or less anasto- 

 mosing with one another and sooner or later running out into separate 

 branches (Fig. 36, A). The trichomes are very densely placed and 



