Stdnrctatrwn xi. DE8MIDIACE£ (W< 361 
16. S. punctulatum Brfb. in Kali's. Brit. Deem. 133, 
i. 1 (1848); W. el G. S. Wesl in Journ. Bot. 1897, p. 181. 
Forma 3-gona. 
Pungo .\mh'\i.".-Iii rivulis PrsBsidii (Casalall) ; Marcl 
No. 105. 
/'('/'///" 1 -_'/<<;/". 
Hi ii. i. \. In oliginosis editioribus prope Humpata, Empalanca el 
Lopollo : May I860. No. 15. 
17. S. dilatatum Ehrenb. [nfus. I 13, t. x. f. L3 (1838); Etalf . 
Brit. Deem. L33, t. xxi. F. 8 (1848); W. el G. 8. West, I.e. 
PlJNGO ANDONGO. — In rivulis 1'iasnlii (< 'a-alal. : i : Match 1857. 
No. 105. 
Var. insignis Elacib. in Etospraw} Akad. (Jmiej. Krakow, 
Wydzial. Mat.-przyr. ser. 2, t. ii. (vol. xxii.) 388, b. vii. F. 13 
(1892); W. et. G. 8. West, I.e. 
LlBONGO. — Ad margines Mum. Lif one ; Sept. 1858. N<>. 204. 
is. S. hexacerum Wittr. in Bih. t. K. Vet.-Akad. Handl. 
Bd. 1. no. 1, 51 (1872); W. el G. 8. West, l.c. Desmidmm$ 
hexaeero8 Ehrenb. Abhandl. Akad. Wissenschaft., Berlin, L833, 
293 (1835); [nfus. I II. t. x. F. 10 (1838). 
LlBONGO.— Ad margines Hum. Lifone : Sept. L858. No. 204. 
ID. S. micron W. et G. 8. Wesl in Journ. I:. M. B. L59, t. iv. 
f. 50-51 (1896). 
Var. angolense W. et <:. 8. Wesl in Journ. Bot. L897, p. 181, 
t, 368, f. Id. 
Hrn.i.A. — Iq paludibus exsiccandis ; April I860. No. 176. 
20. S Gurgeliense Sfhniidlr in Ot'st.M'rrich. Botan. Zeitschr. 64, 
t. xvi. f. 2:). 24 (1896). 
Var. tropicum W. el <;. 8. West in Journ. Linn. Soc. 1897, p. 
182, t. 368, F. 20. 
Hmi. i. \. [n paludibus exsiccandis ; April 1860. No. 176. 
This may be a proper species, but only one example was m.-t with 
and, until Further examples are obtained, it bad better 
a variety of Schmidle's alpine species. 
21. S. elegantissimum Johnson in Bull Torr. Bot. Club, xxi. 
290, t. 211, F. If, (1894). 
Var. reductum W. el G. 8. West in Journ. Bot. L897, p. 182 
Libongo. Ad margines flum. Lifune; Bept. L858. No. 204. 
22. S. cerastoides W. et G. 8. Wesl in Journ. Bot. 1897, p. 182, 
t. 369, F. 13. 
Hi n.i.. v. — In uliginoaifl editioribus prope Bumpata, Empalanca el 
Lopollo, plagaa Bpongiosas unacum Briocauloneis, Xyridibus et 
I'triculariis constituens : .May I860. No. 15. Ktiam in paludibus 
iii.li> ; April I860. No. 178 
This Bpecies possesses in common with its oearest ally S I 
