340 x. zygnemacEjE (West). [Spirogyra 
larger zygospores ; from the latter in its somewhat thicker filaments, 
shorter cells, the character of its chromatophores, and in its shorter 
zygospores. 
The following may belong to this species : — ■ 
Pungo Andongo. — Cellular vegetativas diametro (03-82 pi) li-2J-plo 
longioribus, extremitatibus non replicatis ; chromatophoris 3 (?), 
magnis cum marginibus serratis et pyrenoidibus magnis. In stagnis 
ad latera rivulorum (Casalale) ; Feb. 1857. No. 206 (I.e., p. 42). 
8. Spirogyrae sp., I.e. 
Loanda. — In Angolae stagnis agri Loandensis, pr. Represa de M. 
Pereira ; Feb. 1854. No. 125. 
9. S. cylindrospora W. et G. S. West in Journ. Bot. 1897, p. 42. 
PUNGO Andongo. — In stagnis prope Anbilla (Condo) ; March 1K57. 
No. 177. 
The shortly cylindrical zygospores are very characteristic, fitting the 
cells like plugs pushed into them. 
10. Spirogyrae sp., I.e. 
Golungo Alto.— Freq. in semistagnantibus ad ripas rivi Quiapoze, 
Caminho (road) pr. Mussengue ; Sept. 1855. No. 207- 
XI. DESMIDIACE^E. 
1. GONATOZYGON De Bary (1856). 
1. G. Ralfsii De Bary, Conj. 76-7, t. iv. f. 23-25 (1858) ; W. et 
G. S. West in Journ. Bot. 1897, p. 77. 
PuNGO ANDONGO. — Inter Batrur/ios/n rmxm gracillimum, ad lapides 
submersas in rivulo de Tangue ips. Prassidii ; May 1857. No. 3. 
2. CYLINDROCYSTIS Menegh. (1838). 
1. C. crassa De Bary, Z.c.,74, t. vii. C (1858) ; W. et G. S. West 
in Journ. Bot. 1897, p. 77. 
Pungo Andongo. — Ad latera boreal, et occid. de Pedra Songue ; 
April 1857. No. 12. 
3. PENIUM Breb. (1846). 
1. P. oblongum De Bary, I.e., 73, t. vii. G, f. 1, 2 (1858); W. et 
G. S. West in Journ. Bot. 1897, p. 77. 
Golungo Alto. — Ad margines stagnorum rivi Cuango ; Aug. 1857. 
No. 155. 
HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. Morro 
de Lopollo ; Feb. 1860. No. 192. 
2. Penii sp. 
Long. 28 fx; lat. 11*5 tx; this is probably P. Mooreanum Arch., 
but not seen in sufficient quantity for accurate identification (I.e.). 
Huilla. — Inter Utriculariam cymbantham, Morro de Lopollo ; April 
1860. No. 179. 
3. Penii sp. 
Long. 26 fi; lat. 16 fx. (I.e.). 
Huilla. — Prope lacum Ivantala ; March 1860. No. 17- 
