Oscillatmna] xxi. lyngbye/E (West). 379 



The specimens of this species are very fine ; it is a totally distinct 

 plant from Phormidium angiistissinmm, though it is of the same thict- 

 ness. It possesses no sheath, and the trichomes are much firmer and 

 not so tortuose as those of the latter ; its cells also are shorter and 

 more indistinct. 



XXII. CHAMiBSIPHONEiE. 

 1. SPH.a;ROGONITJM Eostaf. (1883). 



1. S. incrustans Rostaf. in Rosprawy Sprawozd. Posiedz. Akad. 

 Umiej. X. 282, 304-5, t. v. f. 1-7 (1883); W. et G. S. West in 

 Journ. Bot. 1897, p. 301. 



Chamcesiphon incrustans Grun. in Rabenh. Flor. Europ. Alg. 

 ii. 149. 



PuNGO Andongo. — ^Epiphyticum supra Zygnema erieetorum ad 

 Podostemaceas (TristicJia trifaria Tul.) in riv. de Cabondo ; Feb. 1857. 

 No. 108. 



XXIII. CYSTOGONEJ*:. 

 1. DERMOCARPA Crouan (1858). 

 1. D. depressa W. et G. S. West in Journ. Bot. 1897, p. 301. 

 LoANDA. — Epiphytica svupra, PiihopJioram radiantem in aquariis aquae 

 subdulcis insute Cassanga pr. Morro da Cruz ; April 1854. No. 197. 



XXIV. CHROOCOCCACEiE. 



1. GLCEOTHECE Nag. (1849). 



1. G. confluens Nag. Gatt. einz. Alg. 58, t. i. g, f. 1 (1849) ; 

 W. et G. S. West, I.e. 



GoLUNGO Alto. — Cum Chroococco scliizodermatico var. hadio-pm- 

 2nmo, ad rupes juxta riv. Coango ; June 1856. No. 139. 



2. MERISMOPEDIA Meyen (1839). 



1. M. glauea Nag., I.e., 55, t. i. d, f. 1 (1849) ; W. et G. S. 

 West, I.e. 



Gonivjm glaucum Ehrenb. 



Htjilla. — Inter Utriculariam, Morro de Lopollo ; April 1860. 

 No. 179. 



2. M. hyalina KUtz. Phyc. Germ. 142 (1845) ; Tab. Phyc. v. 12, 

 t. 38, f. i. (1855) ; W. et G. S. West, I.e. 



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



3. TETRAPEDIA Reinsch (1867). 



1. T. aversa W. et G. S. West in Journ. Bot. 1897, p. 301. 

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

 No. 177. 



4. GLCEOCAPSA Kutz. (1843) ; em. Nag. (1849). 



1. G. gelatinosa KUtz. Phyc. Gener. 174 (1843) ; Tab. Phyc. i. 

 (1845-9), 15-16, t. 20, f. vi. b ; Rabenh. Flor. Europ. Alg. ii. 39; 

 W. et G. S. West, I.e. 



