Phycotheca Boreali-Americana.

Collins, Holden, and Setchell.

959. Spirogyra affinis (Hass.) Petit.

Petit, Spirogyres des Environs de Paris, p. 18, Pl. III, figs. 13 & 14, 1880.

De Toni, Syll. Alg., Vol. II, p. 758, 1889.

In pool near Illiluik, Alaska, July, 1899.

W. A. SETCHELL and A. A. LAWSON.

Fertile cells not so much swollen as in the type.

Yale University Herbarium

YU.092042