160 ULOTHRICACEAE 
Synopsis of Species 
Cells وو دن‎ hardly constricted at the dissepiments. 
Ce 
r 2.5-3 u, 1-4 times as long, filaments short. I. S. bacillaris. 
eai سي‎ 3-3.5 p, I-10 times as long, filaments elongated. 2. S. scopulinus. 
Cell diameter 5-6 u, 1-2 times as long ; marine form. 3. S. marinus. 
Cell diameter 5-6.5 u, 1-3 times as long, filaments elongated. 4. S. subtilis 
Cells Sean at the dissepiments, or somewhat tumid. 
Cell diameter 6-9.5 ہر‎ on € rocks, earth, etc. 5. S. flaccidus. 
Cell diameter 6.5-9 ہم‎ i 6. S. fluitans. 
Cell diameter 8-11 u, وما‎ Gath 7. S. rivularis. 
1. STICHOCOCCUS BACILLARIS Nägeli, Neue Denkschr. Allgem. 
Schweiz. Gesell. 10’: 77. pl. 4 G. f. r. 1849. Rabenh. Flor. 
Eur. Ale 3: 47. f. 27. 1868. Hansg. Prod. Ale Bohm. 
1:139 7°65. 1886: Phyc. u, Ale Stud. e 4. f. 5. 1887. 
DeToni & Levi, Notarisia, 2: 281-283. 1887; Flor. Alg. 
We. 3: 125. 1888... DeToni, Syl. Alg x: 687. 1886 
Gay, Rech, Sur Alg Vert. 28. M. rr. f. Tez 1891. 
Klercker, Flora, 82: 102. AM. 6. f. 9-13. 1896. 
Protococcus bacillaris Nag.; Kitz. Spec. Alg. 198. 1849. 
Hormococcus flaccidus bacillaris Chodat, Beitr. Krypt. Flor. 
Schweiz, t°: 269. 1902. 
Filaments pale green, fine and short (composed of 2-24 cells, 
DeToni), very readily breaking apart; cells cylindrical but 
slightly constricted at the ends, 2.5-3 » in diameter, 1—4 times as 
long ; chromatophore thin and pale, elliptical ( ^7. 22. f. 7). 
On damp earth or rock, and on flower pots, etc., in green- 
houses, Central Park, New York, June (637). 
Ib. S. BacırLarıs Nag. forma confervoidea f. nov. 
Filaments longer, often crisped, usually growing in association 
with masses of Trıbonema and other confervae ; cell characters as 
in the typical form (ai 22. f. 2, 3). 
Filaments scattered or in small floccose masses, in pools or 
gently flowing water. 
MassacHusETTS: Pine Banks Park, Melrose, April (550). 
New York: Botanical Garden, April (534B); Central Park, 
May. 
New Jersey: Ridgefield, April (298). 
So far as can be seen this form differs from the type only in 
the length of the filaments and in' its habitat. Neither this nor the 
typical form has been studied sufficiently to make it possible abso- 
سس 
