YU.091536

Phycotheca Boreali-Americana. Collins, Holden, and Setchell.

454. Nostoc sphaeroides Kuetz.

Kuetzing, Tab. Phye, Vol. II, p. 2, Pl. IV, fig. 1, 1850.
Bornet & Flahault, Revision des Nost. Het., part 4, p. 212, 1888.

Fresh Pond, Cambridge.

H. M. RICHARDS.

YU.091537

455. Stigonema ocellatum (Dillwyn) Thuret.

Thuret, Essai de Class. des Nost., p. 380, 1875.
Bornet & Flahault, Revision des Nost. Het., part 3, p. 69, 1887.

Attached to sedges, fresh water swamp, Falmouth, Massachusetts,
Aug. 12, 1897.

Small form, about .025 mm. diam.

G. T. MOORE, Jr.