299 CHAETOPHORACEAE 
tinguishes the form from the species as above interpreted, the ex- 
pression “fasciculi ovate or broadly lanceolate” indicates an 
identification with D. acuta. The large diameter (100) is not 
inconsistent with many of our specimens of both species, though 
it is greater than that reported by European authors. 
4. Draparnaldia platyzonata sp. nov. 
Filaments 1—7 cm. long, loosely tufted or solitary ; branches 
mostly opposite or whorled and horizontal ; fascicles of branchlets 
set strictly perpendicular to the branch, prominently stalked, broadly 
orbicular in outline, the branchlets somewhat symmetrically radiat- 
ing from the summits of the branches of the rachis, sometimes 
densely crowded, subfusiform, acuminate or setiferous; cells of 
larger branches cylindrical, sometimes slightly constricted at the 
joints, 50-90 [in diameter, in length equal to the diameter, or 
frequently shorter, chromatophore very wide, always nearly cover- 
ing the length of the cell and often strongly reticular ; diameter of 
terminal branchlets 6-11 ۸ ( A. 47). 
On rocks or sticks, in brooks draining swamps. 
New Jersey: Grantwood, April, 1899 (89), April, 1900 (281), 
May, 1900 (363, type). 
VERMONT : Fifield bog, Wallingford, 2 July, 1901 (641). 
This species in certain stages recalls the figure of D. plumosa 
opposita Lyngbye, Tent. Hyd. Dan. pl. 65A, and resembles the 
specimens of D. glomerata biformis Wittrock and Nordstedt, Alg. 
Exsic. 573. It lacks, however, what seem to be essential char- 
acters of these two forms, namely, the two longitudinal lines sup- 
plying the place of a chlorophyll band in the former, and the 
double character of the filament which gives the name to the latter. 
Our form is always easily recognizable by its short cylindrical cells 
with their broad chromatophore, and by the horizontally set, rosette- 
like, stout-stalked fascicles of branchlets. Though the chromato- 
phore of D. glomerata and D. plumosa is sometimes described as 
a reticular band, it might better be called perforate, while that of 
D. platyzonata attains the maximum of a truly reticular structure. 
This species is more distinct from D. glomerata than the members 
of the D. plumosa-acuta-glomerata series are from one another. 
This view has been confirmed by repeated collections from the type 
station and by cultures of that material. 
