DRAPARNALDIA 219 
PENNSYLVANIA: Chester county, 1890 (H. M. Richards). 
INDIANA : Greencastle, October, 1893 (L. M. Underwood). 
Montana: Great Falls, September, 1885 (F. W. Anderson). 
This species usually has closely set, plumose fascicles of densely 
crowded branchlets. More slender or less branched forms are often 
called D. plumosa pulchella Rabenh., but there is some reason to 
believe that Kützing's D. pulchella may be a more distinct form. 
Some of the material above quoted from Haverhill, Mass., seems 
to correspond to Kützing’s description of D. pulchella in having 
longer, more ventricose cells. Without further collection, how- 
ever, we cannot regard it as more than a young stage of D. plu- 
mosa. 
2. DRAPARNALDIA ACUTA (Ag.) Kütz. Phyc. Germ. 230. 1845; 
Spec. Ale 356. 1849; Tab. Phyc. 3: pl. 77. f. 2. 1853 
D. glomerata acuta Agardh, Syst. Alg. 59. 1824. Rabenh. 
Flor. Eur. Ala. 3: 382. 1868. DeToni, Syll. Alg T: 192 
1889. DeWild. Flor. Alg. Belg. 43. 1896. 
Tufts 1-8 cm. long ; branches ascending or spreading, solitary 
or opposite, somewhat moniliform ; the fascicles of branchlets 
single, opposite or whorled, generally somewhat crowded, ascend- 
ing or spreading, broadly ovate to lance-ovate and acuminate in 
outline; branchlets in the fascicle ascending, the rachis usually 
extended at the apex; ultimate branchlets subulate or setiferous, 
often curved; cells of larger branches somewhat inflated, or above 
nearly cylindrical, 50-90 or more, rarely 110 » in diameter, 1—2 
times as long, chlorophyll band half as wide as the cell-length or 
narrower; diameter of terminal branchlets 6-10 p. 
Exsic.: Tild. Am. Alg. 72 C. (as D. plumosa), Forest Grove, 
Ore., February, 1896 (F. E. Lloyd.) (?) 
In brooks, rills, and semi-stagnant waters. 
CONNECTICUT : Thomaston, May (541, 546, 565, 566). 
New York: Bronx Park, May (370, 408); East Chester, May 
(391), November (518). 
New Jersey: Hudson Heights, May (433); Cresskill, May 
(358) ; Undercliff, May (572). 
This form has usually been considered a variety of D. glomer- 
ata, but it appears to be equally or more closely related to D. 
plumosa. It frequently exhibits, to be sure, the spreading habit 
of branching, the broad fascicles of branchlets, and the inflated: 
