238 welwitsch's affjcan freshwater alg.e. 



7. BoTRYococcus Kiitz. (1849). 



1. B. Micromorus, sp. n, B. familiis libere natantibns, e 

 aggregationibus snbdistantibus 4-muUis cellularum formatis, ag- 

 gregationibus muco indistiucto et filis connexis ; cellulis perparvis 

 globosis vel angulari-globosis confertis 8 (interdnm plus minusve) 

 iu aggregatione unaquaque. Diam. fam. 40-60 ji ; diara, cell. 

 3-4-5 IX. 



Libongo. Ad margines flnm. Lifune; Sept. 1858. No. 204. 



8. OocYSTis Nag. (1855). 



1. 0. Nov« Semli^ Wille iu Ofi\ KomjL Vet.-Akad. FdrJtandl. 

 1879, no. 5, 2G, t. xii. f. 3. Long." cell. 16 // ; lat. cell. 9-5-10 jj.. 



Huilla. In paludibus exsiccandis ; April 1800. No. 176. 



Var. MAXIMUM West in Journ. 11. M. S. 13, t. ii. f. 25 (1894). 

 Long. cell. 33 /x : lat. 23 /x. This is yet a larger form than the 

 British one. 



Golungo Alto. Ad margines stagnorum rivi Cuango ; Aug. 

 1857. No. 155. 



2. 0. soLiTARiA Wittr. in Wittr. & Nordst. Ah/. Aq. Dulc. Exsicc. 

 Fasc. V. No. 244; Bot. Not. 1879, 24. Long. cell. 22-27 /x; lat. 

 11-5-14-5 II. 



Huilla. In uliginosis editioribus prope Humpata, Empalanca 

 etLopollo; May 1860. No. 15. 



Libongo. Ad margines flum. Lifune ; Sept. 1858. No. 204. 



Forma major Wille iu Ofc KuikjI. Vvt.-Akad. Fdrhandl. 1879, 

 no. 5, 26. Long. cell. 40 /x ;' lat. 22'//. 



Huilla. In paludibus exsiccandis; April I860. No. 176. 



9. Athroocystis, gen. n. 



Plantse aquaticfe, familias parvas for mantes, in strato denso 

 pulveruleuto aggregatas ; familiis e cellulis uumerosissimis com- 

 positis, intra tegumentum tenuissimum firmum non mucosum dense 

 confertis. Propagatio ignota. 



1. A. ellipsoidea, sp. unica. A. familiis ellipsoideis, ovoideis 

 vel breviter oblongis ; cellulis subiuaequalibus, rotuudo-polygonis 

 (e mutua pressione) ; contentum cellularum pallide viride et homo- 

 geneum. Long. fam. 48-69 /x, lat. 38-48 /x ; diam. cell. 3-7-5 //. 



Mossamedes. In stagnis lemnigeris cum Typha et Juuco prope 

 Aguada; July 1859. No. 131. 



This alga, by reason of its small families of densely-crowded 

 cells and the nature of its integument, differs considerably from 

 any other genus of Palmellacea. 



10. Glceocystis Nag. (1849). 



1. G. GiGAs (Kutz.) Lagerh. in Ofv. Koutjl. Vet.-Akad. Fdrhandl. 

 1883, no. 2, 63. Protococcus (jii/as Kiitz. Fhyc. Germ. 145 (1845) ; 

 Verwitndl. der Infiis. fig. vi. 1 (1844). Chloiococcum gujas (Kiitz.) 

 Grun. Diam. cell. 11-5-15 fi. 



Libongo. Ad margines flum. Lifune ; Sept. 1858. No, 204. 



