6 



Reinbold has been so kind as to send me several specimens 

 of his species; when compared with these and with the original 

 specimen of Jurgens in »Alg£e aquatic9e«, Dec. XIII, No. 6, 

 our plant as pointed out in my above-cited paper has proved to be 

 quite different. For this reason I have described it as a new species. 

 The Latin diagnosis I have given of this species is: 

 Fronde filiformi, cyjindrica, tortuosa, simplici, vel raris- 

 sime prolificationibus instructa. Thallo ssepissime solido, ex tri- 

 bus (in prolificationibus aut duobus aut singulis) seriebus cellu- 



Fig. 1. Enteromorpha chcetomorphoides Borgs. 

 a and b, parts of filaments; c, apex of a filament with proliferation; d, fila- 

 ment with proliferation e and /, transverse section of filaments, (a, b, e, f, 

 about 250:1; c, d, about S0:1). 



larum composito; interdum crassiore et tubuloso, plures series 

 cellularum continente. Cellulis majoribus, subquadratis vel 

 rectangularibus, 16 — 18 ^ crassis. Fig. 1. 



Lat. fd. 3 ser. cellularum composita = ca. 45 ,«. 



Lat prolific, tenuior. = 15 — -16 /^. 



To this description I may add that the plant, like Chseto- 

 morpha, forms loose-lying entangled masses, the filaments twisted 

 between each other. The proliferations occur very seldom, 

 most often only at the apices of the filaments (Fig. 1 c): only 

 once have I found a proliferation growing out from the side of 

 a filament far from the top (Fig. 1 d). While the filaments com- 

 monly consist of three rows of cells (Figs. 1 a, b, e) the thinner 

 proliferations only consist of two and at last of a single row of 

 cells only. The filaments consisting of 3 rows of cells are solid 

 (Fig. 1 e) while the thicker but rarer filaments with several rows 

 of cells are hollow in the middle (Fig. 1 /). The chromatophore 

 lies near the free wall of the cell and contains two pyrenoids, 

 seldom three (Fig. lb). 



