378 XXI. LYNGBYEi^E (West). [Phormidium 



7. P. autumnale Gomont in Ann. Sci. Nat., I.e., 187-190, t. 5, 

 f. 23, 24 (1892). 



Oscillatoria autumnalis Ag., I.e., 36 (1812). 



Forma tenuis W. et G. S. West, in Jouin. Bot. 1897, p. 299. 



GoLUNGO Alto. — Cum P. lammoso ad terrain limosam post pluvias ; 

 Dec. 1855. No. 166. 



4. PROTERENDOTHRIX W. et G. S. West in Jouin Bot. 

 1897, p. 299. 



1. P. scolecoidea W. et G. S. West, I.e. 



HuiLLA. — In Porphyrostphone Notarisii, prope lac. Ivantala; March 

 1860. Nos. 17 and 18. 



This genus must be placed in the Lynghyeo' on account of the 

 structure of the sheath, which contains a solitary trichome. The com- 

 parative width of the sheath, its hyaline character with irregular 

 margin, along with the peculiar habit of the plant, characterise the 

 genus. The younger plants (consisting of short filaments of 12-20 

 cells) are endophytic, occurring between the lamellae of the sheath of 

 Povphyrosiphon. As they increase in size they appear to break through 

 the outer lamellse of the sheath of the host, and to attach themselves 

 closely to its outer surface by means of their own mucous envelope, 

 which is now considerably broader. 



.5. OSCILLATORIA Yauch. (1803). 



1. 0. limosa Ag. Dispos. Algar. Suec. 35 (1812) ; Gomont in 

 Ann. Sci. Nat. 7^ serie, Bot. xvi. 610-2, t. 6, f. 13 (1892) ; W. et 

 G. S. West in Journ. Bot. 1897, p. 300. 



SiERKA Leone. — Ad terram et parietes juxta fontes prope Free- 

 town ; Sept. 1853. No. 168. 



2. 0. tenuis Ag. Algar. Decas ii. 25 (1813) ; Gomont, /.c, 220-1, 

 t. 7, f. 2-3 (1892) ; W. et G. S. West, I.e. 



Ins. Pkincipis. — In stagnantibus prope Bahia de S. Antonio, ad 

 limum subexsiccantem late csespitosa ; Sept. 1853. No. 169. 



MosSAMEDES. — Cum Toh/potriche limbata in stagnis profundis prope 

 Cavalheiros ; Aug. 1859. No. 191. 



3. 0. animalis Ag. in Flora, x. 632 (1827) ; Gomont, I.e., 227-9 

 t. 7, f. 13 (1892) ; W. et G. S. West, I.e. 



Sierra Leone. — Cum Phormidio Cor'mia ad parietes humid, verticales 

 urbis Freetown, freq. latissimis plagis atro-nitentibus parietes obducens; 

 Sept. 1853. No. 167- 



4. 0. formosa Bory, Diet. Class. d'Hist. Nat. xii. 474 (1827); 

 Gomont, I.e., 230-1, t. 7, f. 16 (1892) ; W\ et G. S. West, I.e. 



LoANDA. — In limo humido urbis Loanda; ; April 1858. No. 170- 



5. 0. Okeni Ag. in Flora, x. 633-4 (1827); Gomont, I.e., 232 

 t. 7, f. 18 (1892) ; W. et G. S. West, I.e. 



LoANDA. — In fonte tepida, sulphate (ferri ?) abundanti, pr. S. Pedro 

 freq. ; July and Aug. 1854. No. 164. 



6. 0. angustissima W. et G. S. West in Journ. Bot. 1897, p. 300. 

 LoANDA. — Cum 0. Oheni in fonte tepida, sulphate (ferri ?) abun- 

 danti, pr. S. Pedro freq. ; July and Aug. 1864. No. 164. 



