■Staurastrum xi. desmidiace^ (West). 361 



16. S. punotulatum Br6b. in Ealfs,'Brit. Desm. 133, t. xxii. 

 f. 1 (1848); W. et G. S. West in Journ. Bot. 1897, p. 181. 



Forma 3-gona. 



PuNGO AxDONGO.— In rivulis Preesidii (Casalale) ; March 1857. 

 No. 105. 



Forma i-gona. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



17. S. dilatatum Ehrenb. Infus. U3, t. x. f. 13 (1838); Ealfs, 

 Brit. Desm. 133, t. xxi. i. 8 (1848); W. et G. S. West, I.e. 



PuNGO Andoxgo. — In rivulis Prsesidii (Casalal^) : March 1857. 

 No. 105. 



Var. insignis Racib. in Eosprawy Akad. Umiej. Krakow, 

 Wydzial. Mat.-przyr. ser. 2, t. ii. (vol. xxii.) 388, t. vii. f. 13 

 (1892); W. et. G. S. West, I.e. 



LiBONGO. — Ad margines flum. Lif une ; Sept. ] 858. No. 204. 



18. S. hexaeerum Wittr. in Bih. t. K. Vet.-Akad. Handl. 

 Bd. 1. no. 1, 51 (1872); W. et G. S. West, I.e. Desmidium ? 

 Aexaeeros Ehrenb. Abhandl. Akad. Wissenschaft., Berlin, 1833, 

 293 (1835); Infus. 141, t. x. f. 10 (1838). 



LiBONGO. — Ad margines flum. Lifune ; Sept. 1868. No. 204. 



19. S. micron W. et G. S. West in Journ. E. M. S. 159, t. iv. 

 f. 50-51 (1896). 



Var. angolense W. et G. S. West in Journ. Bot. 1897, p. 181, 

 t. 368, f. 19. 



HuiLLA. — Iq paludibus exsiccandis ; April 1860. No. 176. 



20. S Gurgeliense SchmidleinOesterreich. Botan. Zeitsclir. 64, 

 t. xvi. f. 23, 24 (1896). 



Var. tropicum W. et G. S. West in Journ. Linn. Soc. 1897, p. 

 182, t. 368, f. 20. 



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



This may be a proper species, but only one example was met with 

 and, until further examples are obtained, it had better be regarded as 

 a variety of Schmidle's alpine species. 



21. S. elegantissimum Johnson in Bull. Torr. Bot. Club, xxi. 

 290, t. 211, f. 16 (1894). 



Var. reductum W. et G. S. West in Journ. Bot. 1897, p. 182. 

 LiBONGO. — Ad margines flum. Lifune ; Sept. 1858, No. 204. 



22. S. cerastoides W. et G. 8. West in Journ. Bot. 1897, p. 182, 

 ■t. 369, f. 13. 



HuiLLA. — In uliginosis editioribus prope Humpata, Empalanca et 

 Lopollo, plagas spongiosas unacum Eriocauloneis, Xyridibus et 

 IJtrioulariis constituens ; May 1860. No. 15. Etiam in paludibus 

 exsiccandis ; April 1860. No. 176. 



This species possesses in common with its nearest ally S. Cerastes 



