ALO^ FROM THE WEST INDIES. 2G9 



Class Phtcochromace^. 



Subclass XoSTOCHIN^EiE. 



Ord. NosTOCACE^. 



15. NoSTOC HUAIIFUSUM, Carm. ex Harvey in Hookers Brit, 

 Flora, ii. p. 399. {Kuetz. Species Alrjar. p. 301 ; Eahh. Fl. 

 Furop, Alg. ii. p. 183.) 



Diam. cell. 2-3 \i ; diam. lieterocysfc. 3*5 \i. 

 Hah. On lime-trees, Sliaiiford Estate, Dominica. No. 901. 

 On trees, summit of Trois Pitons (1500 ft.), Dominica. Xo. 903. 



16. IS". SPHERIC c:m, VaucJier. {Cooke, Brit. Freshw. Alq. 

 p. 231, t. 91. If. 8-11; Bornet et Flaliault, Fevis. des Nostoch. 

 Heterocyst. p. 208.) 



Diam. cell. 38 /it ; diam. heterocyst. 5-5*7 i-l ; diatii. thall. usque 

 ad 10 mm. 



Hah. On damp wall of dam in Sharp's River, St. Vincent. 

 No. 477. 



Ord. SCTTOXEMACEJE. 



17. MiCROCHiETE TENUISSIMA, UOV. Sp. (PI. XIV. figS. 7-11.) 



M, 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. 4'1-51^; crass, trich. 1-1'8/u; crass, heterocyst. 

 2-2'4/u; long, heterocyst. 3"5-6'5 //. 



Hah. Amongst Symploca cuspidata, n. sp., on trees, summit of 

 Trois Pitons (1500 ft.), Dominica. No. 901. 



18. Sci'TONEMA java:nicum, Bornet {in Bornet et Thuref, 

 Notes Algologiques, p. 148 ; Bornet et Flali. Fevis. des Nostoch. 

 Heterocyst. p. 95). [Symphyosiphon javanicus, Kuetz. Species 

 Algarum, p. 323 ; TahulcB phycolog. ii. p. 13, t. 43. f. i.] (Pi. XIV. 

 ligs. 12-15.) 



Crass, fil. 13-16 /z; crass, trich. 8*5-11 fi. 



Hah. On lime-trees, Shanford Estate, Dominica. No. 901. 

 Anguilla, W. Indies. (23-3-92.) No. 70. On the walls, Eoseau, 

 Dominica. (9-7-92.) No. 236. 



The above agrees well with this species, the most notable dif- 



