Phycotheca Boreali-Americana
Collins, Holden & Setchell.

1708, Oscillatoria margaritifera Kuetz.

Kueztzing in Gomont, Monogr. des Oscill., p. 256, Pl. VI, fig. 19, 1805.

Forti, Syll. Myx., p. 161, 1907.

Tilden, Minn. Algae, Vol. I, p. 69, Pl. IV, fig. 11, 1910.

a. In salt marshes, Eastham, Massachusetts, July 13, 1907.

b. Similar station, Eastham, Sept., 1910.

F. S. COLLINS

c. Floating in pools of salt water in marshes, Oakland, California, Aug., 1905.

d. On moist ground and in salt water, Oakland, Sept. 5, 1905.

N. L. GARDNER.