FEESHWATEE ALGiE OF TITE WEST INDIES. 287 



*38. Scytonema Hofaianni, Aqctrdh, Syn. Algar. Scand. 

 18 17, p. 117 ; Born, et Flah., " Bevis. des Nostoc. Heterocyst." 

 Ann. des Sci. Nat. 7 e ser. Bot. vol. v. (1887) p. 97. Scytonema 

 Julianum, Meneyh. 



The filaments, which were not incrusted with lime, were 

 strongly agglutinated together in vertical tufts about 2 to 4 mm. 

 high, in the manner of a Symploca or some species of Schizothrioc. 

 The sheath was perfectly colourless and very thin ; the branches 

 were very scarce and sometimes single. The cells were more 

 often longer than broad, and varied from subquadrate to twice 

 longer than their diameter. 



Crass, fil. 9 - 5-105 \x ; crass, trich. 7-7*5 jx. 



Hab. Head of Castle Bruce River, Dominica. No. 1484. 



39. S. amplt/m, West, " Alg. West Indies" Journ. Linn. Soc, 

 Bot. vol. xxx. (1894) p. 270. 



Rah. On rocks, Castle Bruce Kiver (2000-3000 ft.), Dominica. 

 3STo. 1697. 



40. S. mieabile. Conferva mirabilis, Dillw. Scytonema 

 figuratum, Agardk, Syst. Algar. p. 38. S. calotrichoides, Kuetz. 

 Spec. Alyar. p. 307 ; Tab. Bliyc. ii. p. 6, t. 22. f. ii. ; Babenh. 

 Flor. Furop. Alyar. ii. p. 253. 



Crass, fil. 20-23 fx ; crass, trich. 7*5-9*5 /u. 

 Sab. On rocks, Hampstead Valley (850 ft.), Dominica. 

 No. 2171. 



*41. Toltpotheix btssoidea, West Sf Gr. S. West, " Welw. 

 Afric. Freshiv. Alg., v Journ. Bot. xxxv. 1897, p. 267. Hassallia 

 byssoidea, Rass. Brit. Freshw. Alg. i. p. 233-4 ; ii. t. 67. f. 5 ; 

 Born, et Flah., " Bevis. des Nostoc. Reterocyst." Ann. Sci. Nat. 

 T ser. vol. v. (1887) p. 116. 



Crass, fil. 16*5-18 ii ; crass, trich. 10*5-12*5 /jl. 



Hob. On leaves, AVotten Waven, Dominica. No. 1240. 



Although the form seen occurred on the leaves of trees, it 

 -agreed with the f. saxicola, Grrunow (in Born, et Flah. I. c. 

 p. 117) and not with the f. lignicola, Born, et Flah. The sheaths 

 of the younger filaments were almost colourless, and those of the 

 older filaments were somewhat rough on the exterior. The cells 

 in some of the filaments were almost as long as broad. 



