Mr. J. Ralfs on the Nostochinee. 333 
cylindrical, truncate. Spherozyga elastica, Agardh, Teones Alga- 
rum Europzarum. Cylindrospermum elongatum, Kiutzing, Spe- 
cies Algarum, p. 294 (1849) ; Tabula Phycologicz, t. 99. fig. 111. 
Cromlyn Bog near Swansea, J. R. 
Sweden, dgardh ; Germany, Braun. 
Stratum deep bluish green, tender. Filaments elongated, 
constricted at the dissepiments. Ordinary cells about equal in 
length and breadth ; but when dividing they lengthen, and though 
quadrate in the recent plant they acquire slightly rounded angles 
when dry. Vesicular cells at first barrel-shaped, finally elliptic. 
Sporangia cylindrical, four to eight times longer than broad, 
their ends at first truncate, but rounded after separation. 
The moniliform filaments and shorter joints distinguish this 
species from Spherozyga leptosperma, and its elliptic vesicular 
cells from S. Jacobi and S. Carmichaelit. 
Puate VIII. fig. 9. a, immature filament ; 6, mature state. 
** Filaments moniliform ; sporangia turgid, much broader than the 
ordinary cells. 
4. S. Broomeii (Thwaites). Filaments moniliform, elongated ; ordi- 
nary jomts suborbicular ; vesicular cells barrel-shaped or elliptic ; 
sporangia elliptic, catenate. Spherozyga Broomeii, Thwaites. 
Brackish ditch at Shirehampton, near Bristol, Mr. Broome. 
Stratum bluish or yellowish green. Filaments elongated, ob- 
tuse ; ordinary cells at first nearly quadrate, but finally orbicular. 
Vesicular cells smooth, at first barrel-shaped, then elliptic, 
broader than the ordinary joints, but not so broad as the spo- 
rangia, which are elliptic and numerous. 
The gelatinous matrix is firmer than in many species of: this 
genus, and under the lens can be detected without difficulty. 
The numerous sporangia in each series distinguish Spherozyga 
Broomeu from every other species I am acquainted with. 
Piate VIII. fig. 10. a, immature filament ; 6, mature state. 
5. S. Berkeleyana (Thwaites). Ordinary joints spherical or slightly 
compressed ; vesicular cells spheroidal, compressed, as broad as the 
large turgid-elliptic sporangia. Spherozyga Berkeleyana, Thwaites. 
Brackish ditch at Shirehampton, near Bristol, Mr. Thwaites. 
Filaments elongated ; ordinary joints nearly globular, some- 
times compressed and slightly broader than long, terminal ones 
longer and somewhat tapermg. The vesicular cells are globular 
in dried specimens (but Mr. Thwaites informs me that in the re- 
cent state they are compressed) ; they are nearly as broad as the 
sporangia, which are large, broadly elliptic, and sometimes almost 
globular. 
