1913] Blanchard,— Two new Species of Stigonema 195 
fied the plant he sent out, and that he had distributed S. anomalum 
under the name of S. ocellatum. S. anomalum has main filaments of 
about the size of S. ocellatum; as in that species, they consist usually 
of a single series of cells, occasionally two cells being side by side; 
otherwise, there is little resemblance. S. anomalum differs from S. 
ocellatum in the following ways: 
Ist. The wall is not very thick; the outline is straight, not follow- 
ing the individual cells. 
2nd. There is no lamination either of the general wall, or about 
the individual cells. This latter, annular lamination, is what gives 
S. ocellatum its specific name. 
3rd. The wall is usually colorless; in S. ocellatum it is generally 
colored, sometimes very strongly. 
4th. In S. anomalum the cells are not rounded, but are mostly disci- 
form. 
5th. The branching is repeated, usually with diminution of diame- 
ter. 
6th. The hormogones are generally longer than in S. ocellatum. 
7th. The way the branches arise in S. anomalum is rather of the 
Hapalosiphon type, the one or two cells in the main filament appearing 
to belong to the branch rather than to the main filament. 
Specimens of Stigonema anomalum will be distributed in the Phy- 
cotheca Boreali-Americana; the material was preserved in formalin 
before it was dried, and somewhat shrunken specimens are the result. 
In the material collected in 1909, as above described under Stigonema 
anomalum, there was also found a new species of Hapalosiphon. Al- 
though there is no doubt that it is a Hapalosiphon, yet it is even more 
an intergrading form between Hapalosiphon and Stigonema than is S. 
anomalum. It was found free-floating under the same conditions as 
S. anomalum, but in appearance it is a small, soft sod a few millimeters 
across, of a blue-green to brownish color. 
In the vegetative condition the plant consists of blue-green or brown- 
ish filaments from eight to sixteen microns wide that are repeatedly 
branched in every direction. "Thereis a tendency for the branching to 
be unilateral as in S. anomalum, and for the secondary branches to be - 
less in number than the primary branches. "The branches do not taper 
toward the extremities, but are sometimes slightly clavate. The 
branches may or may not be slightly narrower than the primary fila- 
ment. The cells are nearly always disposed in a single row. The 
