Phycotheca Boreali-Americana.

Collins, Holden & Setchell.

1613. *Seytonema crispum* (Ag.) Bornet.

Bornet, Les Nost. Het. du Syst. Alg., p. 13, 1887.

Forti, Syll. Myxophyc., p. 498, 1907.

S. circinatum, Bornet & Flahault, Revision des Nost. Het., part 3, p. 80, 1887.

Wolle, F. W. Algae of the U. S., p. 254, Pl. CLXXXV, figs. 8-10, 1887.

Oscillatoria crispa Agardh, Syn. Alg., p. 108, 1817.

In a small pond, Nantucket, Massachusetts, Aug. 15, 1909.

JACOB SCHRAMM.

Forms of this species were distributed as P. B. - A., Nos. 60 & 655. The material here distributed is a form with thin sheath and frequent heterocysts, and is producing abundant hormogonia.

Yale University Herbarium

YU.094671