340 X. ztgnemacEjE (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. — Cellulse vegetativae diametro (63-82 /n) H-2^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. Westin Journ. Bot. 1897, p. 42. 

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



No. 177. 



The shortly cylindrical zygospores are very characteristic, fitting the 

 cells like pings 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. 



XL DESMIDIACE^. 



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 Batrachospermum gracillinium, ad lapides 

 submersas in rivulo de Tangue ips. Prsesidii ; May 1857. No. 3. 



2. CYLIXDROCYSTIS Menegh. (1838). 



1. C. crassa De Bary, l.c.JA, 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. 



GoLTJNGO Alto. — Ad margines stagnorum rivi Quango ; Aug. 1857. 

 No. 155. 



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

 de LopoUo ; Feb. 1860. No. 192. 



2. Penii sp. 



Long. 28 /a; lat. 11*5 /x; this is probably P. Moweanum Arch., 

 but not seen in sufficient quantity for accurate identification (I.e.). 



HuiLLA. — Inter Utriculariam cymbantham, Morro de LopoUo ; April 

 1860. No. 179. 



3. Penii sp. 



Long. 26 fx; lat. 16 /a (I.e.). 



HuiLLA. — Prope lacum Ivantala ; March 1860. No. 17- 



