ALGE FROM THE WEST INDIES. 269 
Class PHYCOCHROMACES. 
Subclass Nosrocuinex. 
Ord. Nosrocacez. 
15. Nostoc numiFusumM, Carm, ex Harvey in Hooker's Brit. 
Flora, ii. p. 399. (Kuetz. Species Algar. p. 8301; Rabh. Fl. 
Hurop. Alg. ii. p. 183.) 
Diam. cell. 2-3 » ; diam. heterocyst. 3°5 pu. 
Hab. On lime-trees, Shanford Estate, Dominica. No. 901.— 
On trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. 
16. N. spxaricum, Vaucher. (Cooke, Brit. Freshw. Alg. 
p- 231, t. 91. 8-11; Bornet et Flahault, Révis. des Nostoch. 
Heétérocyst. p. 208.) 
Diam. cell. 38; diam. heterocyst. 5-5:7 x; diam. thall. usque 
ad 10 mm. 
Hab. On damp wall of dam in Sharp’s River, St. Vincent. 
No. 477. 
Ord. ScyTONEMACES. 
17. Microcu#te TENUISSIMa, nov. sp. (PI. XIV. figs. 7-11.) 
Mf. inter algas varias alias reperta; filis tenuissimis, sub- 
intricatis, contortis; vaginis hyalinis, achrois, amplis; articulis 
elongatis, diametro 5-9plo longioribus, articulis junioribus bre- 
Vioribus (circiter diametro duplo longioribus) et crassioribus ; 
heterocystis intercalaribus, subquadratis vel oblongis. 
Crass. fil. 4-4-5:1y; crass. trich. 1-1°8; crass. heterocyst. 
2-2°4-4; long. heterocyst. 3°5-6°5 p. i 
Hab. Amongst Symploca cuspidata, n. sp., on trees, summit of 
Trois Pitons (4500 ft.), Dominica. No. 904. 
18. Scyronema savantcum, Bornet (in Bornet et Thuret, 
Notes Algologiques, p. 148; Bornet et Flah. Révis. des Nostoch. 
Heétérocyst. p. 95). [Symphyosiphon javanicus, Awe¢z. Species 
Algarum, p.323 ; Tabule phycolog. ii. p. 13, t. 43. fi.) (PL XTY. 
figs. 12-15.) 
Crass. fil. 13-16 x; crass. trich. 8°5-11 p. 
Hab. On lime-trees, Shantord Estate, Dominica, No. 901.— 
Anguilla, W. Indies. (23-3-92.) No. 70.—Ou the walls, Rosean, 
Dominica. (9-7-92.) No. 236. . 
The above agrees well with this species, the most notable dif- 
