342 XI. DESMiDiACE^ (West). [Closterium 



2. C. peracerosum Gay, Essai Monogr. Conj. 75, t. ii. f. 18 

 (1883); Bull. Soc. Bot. Fr. xxxi. 339 (1884). 



Var. setMopieum W. et G. S. West in Journ. Bot. 1897, p. 78, 

 t. 365, f. 9. 



PuNGO Andongo. — In stagnis prope Anbilla (Condo) ; March 1857. 

 No. 177. 



3. C. acerosum Ehrenb. Abhandl. Akad. Wissenschaft. Berlin 

 {1831), 68 (1832) ; Ralfs, Brit. Desm. 164, t. xxvii. f. 2. 



Vibrio acerosus Schrank. 



Var. angolense W. et G. S. West in Journ. Bot. 1897, p. 79. 

 GOLUNGO Alto. — Ad margines stagnorum rivi Cuango ; Aug. 1857. 

 No. 155. 



4. C. turgidum Ehrenb. Infus. 95, t. 6, f. 7 (1838) ; Ralfs, I.e., 

 165, t. xxvii. f. 3 (1848) ; W. et G. S. West in Journ. Bot. 1897, 

 p. 79. 



A shorter form than the typical one. 



MossAMEDES. — In stagnis exsiccatis ad ripas flam. Bero ; June 1859. 

 No. 171. 



5. C. Leibleinii KUtz. in Linnsea, viii. 596, t. xviii. f. 79 (1833) ; 

 Ealfs, I.C., 167-8, t. xxviii. f. 4 (1848) ; W. et G. S. West in 

 Journ. Bot. 1897, p. 79. 



Two forms : — 



LoANDA. — In stagnis (Represa de Luiz Gomes) ; Feb. 1858. No. 136. 

 Lat. .38 /i. 



PuNGO Andongo. — In stagnis prope Anbilla (Condo) ; March 1857. 

 No. 177. Lat. 22 ix.. 



6. C. regulare Breb. in Mem. Soc. Imp. Sciences, Cherbourg, 

 iv. 148-9, 304, t. ii. f. 35 (1856). 



Forma minor W. et G. S. West in Journ. Bot. 1897, p. 79. 



HuiLLA. — Cum NitellcB sp. in stagnis pr. Catumba ; April 1860. 

 No. 189. 



Some algologists appear to confuse this plant with C. costatum 

 Corda ; it is, however, very distinct from it. 



5. DOCIDIUM Breb. (1844). 



1. D. trigeminiferam W. et G. S. West in Journ. Bot. 1897, 

 p. 79, t. 368, f. 32-34. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. Etiam 

 inter Utricularian cymbantham, Morro de Lopollo ; April 1860. 

 No. 179. 



This species is readily distinguished from D. baculum Brdb. by the 

 much slighter basal inflation with no constriction above it, and by the 

 different basal granules. 



6. PLEUROT-ffiNIUM Nag. (1849). 



1. P. sparsipunctatum W. et G. 8. West in Journ. Bot. 1897, 

 p. 79, t. 365, f. 10. 



PuNGO Andongo. — In stagnis prope Anbilla (Condo) ; March 1857. 

 No. 177. 



This species can be compared with P . guhcoronulatum (W. B. Turn.) 

 West, and P. conjunctum (W. B. Turn.). 



