THE FRESHWATER ALGJE OF CEYLON. 2038 
Genus CYLINDROSPERMUM, Kuetz. 
928. CYLINDROSPERMUM TROPICUM, sp. n. C. filis natantibus in stagnis, trichomatibus 
pallide szerugineis, articulis cylindricis, diametro 21-3-plo longioribus, ad geniculis 
constrictis ; heterocystis articulis duplo crassioribus, late ellipticis; sporis maximis, 
oblongo-ellipticis, episporio papillato fuscescente. 
Crass. trich. 3 u; lat. heterocyst. 5'8-6'5 u; long. heterocyst. 8 u; long. spor. 
42-43 u ; lat. spor. 19 u. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
This species is nearest to C. majus, Kuetz., especially in its papillate spores, but it is 
easily distinguished by the narrower trichomes, the much longer cells, and the large size 
of the spores. 
Suborder HOMOCYSTE Æ. 
Family VAGINARIEJE. 
Genus SCHIZOTHRIX, Kuetz. 
929. SCHIZOTHRIX LARDACEA, Gomont, in Ann. Sci. Nat. 7* série, Bot. xv. p. 311, t. 8. 
figs. 8, 9. 
Hab. Paddyfields, Heneratgodha. 
330. ScHIZOTHRIX DELICATISSIMA, West & G. S. West, in Journ. Bot. xxxv. 1897, p. 269. 
Long. tot. fil. 153-200 u; crass. fil. 5°5-6°5 u; crass. Dich, 07-09 u. 
Hab. Among Stigonema panniforme on summit of Hakgala Rock. 
Genus DAsYGLÆŒA, Thwaites. 
331. DASYGLŒA AMORPHA, Thw. in Engl. Bot., Suppl. 1848, t. 2941; Kuetz. Spee. Algar. 
p. 272; Gomont, /.¢. p. 347, t. 13. figs. 11, 12. 
Crass. trich. 4°5-5°5 u. 
Hab. In artificial tank, Peradeniya. 
Family LYNGBYES. 
Genus PrEcTONEMA, Thuret. 
332. PLECTONEMA WOLLEI, Farlow, in Bull. Bussey Instit. 1875, p. 77 (note); Gomont, 
l.c. xvi. p. 98, t. 1. fig. 1. Lyngbya Wollei, Farlow, 1876. 
Crass. fil. 45-65 u; crass. trich. 36-45 u. 
Hab. In large masses, in artificial tank, Peradeniya. 
SECOND SERIES.—BOTANY, VOL. VI. 2F 
