STICHOCOCCUS 161 
lutely to connect the two in life history ; but as there is every 
reason to believe that this is only a form which has been favored 
by a more abundant supply of water, we feel obliged to make this 
disposition of it. As it is a generally distributed, though not 
abundant form, one may better call attention to it than ignore it. 
2. Sti scopulinus sp. nov. 
Filaments forming long, bright green, lubricous masses; cells 
cylindrical, not constricted at the dissepiments, 3-3.5 rin diameter, 
1-10 times as long: cell-wall very thin: chromatophore narrow, 
pale green, without a distinct pyrenoid: asexual reproduction, by 
means of a single zoospore formed in each cell, more frequent 
than the vegetative mode (oi 22, کر‎ 4-6) 
Hanging in skeins from dripping rocks, Morningside Park 
New York, April (263, 321A, 285, 353 7. e, 531). 
This species is distinguished from Stichococcus bacillaris f. con- 
Ferviodea usually by longer cells, and by its manner of growth in 
long dense masses of straight filaments instead of in scattered, 
crisped filaments or small floccose masses, as in that form. 
It is usually abundant at the type station during the winter and 
early spring. Later it gives way to S. subtilis, but careful and re- 
peated observations have furnished convincing evidence that it is - 
not a young stage of that plant, but a distinct species. 
Stichococcus scopulinus does not long persist in the filamentous 
state when brought into the laboratory ; very soon it either breaks 
up into the coccoid state or forms zoospores abundantly. 
3. Stichococcus marinus (Wille) 
Ulothrix variabilis Kitz. (?) forma marina Wille, Dijmphna- 
Togtets Zoöl.-bot. Udbytte, 87. ai 73. f. & 1885. (?) 
Filaments dark green ; cells cylindrical, 5-6 مم‎ in diameter, 1—2 
times as long; chromatophore a roundish or oblong plate, pyre- 
noid indistinct. 
One zoóspore is formed in a cell and escapes through a small 
round aperture (9. 27, f. 8, 9). 
Exsıc.: Phyc. Bor. Am. 675. Ash Creek, Bridgeport, Conn., 
August, 1895 (I. Holden), incorrectly quoted as U. variabilis 
litz. var. marina Wille, Rhodora, 2: 12. 1900. 
In tangled masses about culms of Spartina, in company with 
Ulothrix implexa; bank of Yellow Mill Pond, Bridgeport, Conn., 
