WELWITSCH's AFRICAN FKESHWATER ALG^. 35 



June 1858. No. 198. Also drawn up from the bottom of the drain 

 at. Welvvitsch's house in Loanda, a stream which hardly receives 

 the light of day through a narrow slit in the cover ; April 1859. 

 No. 145. 



VI. — CnROOLEPIDACEiE. 



1. Trentepohlia Mart. (1817). 



1. T. lagenifera (Hildebr.) Wille, in Priugsh. Jahrb. xviii. 427 

 (1887). Ckruolepus lageniferum Hildebr. in But. Zeit. 85, t. iii. (1861). 

 Crass, fil. 12-5-15 /a; crass, zoogonidang. 23 /x, altit. 38 //. 



Golungo Alto. Inter Scytonema inslyne ad rupes rivul. Coango 

 humect. ; June 1856. No. 140. 



2. T. phyllophila, sp. n. T. epiphytica et phyllophila, in vivo 

 et exsiccato viridis, filamenta rigidula patentim ramosa ; cellulis 

 diametro 1-1^-plo longioribus, leviter constrictis ad dissepimenta ; 

 ramis brevibus plerumque imilateralibus, filo primario jequalibus, 

 erectis (angulos rectangulos formantes) interdum subdeflexis, cellu- 

 lis diametro 1-2-plo longioribus ; zoogonidangeis magnis obovatis 

 vel pyriformibus, sessilibus, apicalibus vel lateralibus, granulis 

 minutissimis viridibus farctis. Crass, cell, veget. 4'5-5*7 /a; long, 

 zoogonidang. 20-26 /x, lat. 13-5-15*5 /x. 



Golungo Alto. Ad folia plantfe aculis monocotyl. (quam non- 

 dum fiorentem vidi) in Mata de Quisuscula, prope Bango ; July 



1857. No. 148. 



The green contents entirely fill the cells when living, but when 

 dry they contract into a double-cone-shaped or dumb-bell-shaped 

 mass in each cell. The branches rarely bear branchlets, except 

 very short ones consisting of one or two cells. The species which 

 most nearly approaches it is T. tenuis (Zell.) De Toni, from which 

 it differs in its green colour, in its rather smaller size, in the equal 

 thickness of its primary filaments and branches, and in its obovate 

 zoogonidangia. 



Forma subuana, fuscescens, cellulis paullo tumidis; crass, fil. 

 5-6 /x. 



Golungo Alto. Ad muscorum surculos in rupibus juxta rivulos 

 de Zengos do Queta ; July 1856. No. 143. 



VII. — Cladophorace^ . 

 1. RnizocLONiuM Kiltz. (1843). 



1. R. crassipellitum, sp. n. K. terrestre, cjespitosum, flavo- 

 virescens, flaccidula; filamentis crispulis, simplicibus (ramulis radi- 

 cantibus nullis), cellulis diametro 1^-3-plo longioribus, hinc inde 

 ventricoso-inflatis, curvatis et genuflexis ; meuibrana crassissima 

 et valde lamellosa ; cellulis apicalibus subatteuuatis et rotundatis ; 

 cellulis basalibus sjupe inflatis et interdum in rhiziuis sublongis 

 productis; zoogonidiis (ut observatis cl. Welw.) parvis, subspha;ricis. 

 Crass, fil. 33-43 /x; crass, niembr. cell. 7-10'5 f.. 



Loanda. In terra humida umbrosa locis cultis, Loanda ; Aug. 



1858. No. 205. 



This species is characterized by its terrestrial habit, its very 

 thick cell-Wiills, and the absence o*" rhizoids. 



D 2 



