Phycotheca Boreali-Americana.

Collins, Holden and Setchell.

1143. Polysiphonia opaca (Ag.) Zan.

Zanardini, Synopsis Alg., p. 63, 1841.

J. G. Agardh, Sp. Alg., Vol. II, p. 1055, 1863.

Hutchinsia opaca Agardh, Syst. Alg., p. 148, 1824.

On rocks at low tide, Key West, Florida, Sept., 1896.

MRS G. A. HALL.

Yale University Herbarium

YU.092226