Yale University Herbarium

YU.094456

Phycotheca Boreali-Americana.

Collins, Holden, and Setchell.

1416. Spirogyra communis

(Hass.) Kuetz.

Kuetzing, Sp. Alg., p. 439, 1849.

Petit, Spirogyres des Environ de Paris, p. 16, Pl. V, figs. 1-3,
1880.

Wolle, F. W. Algae of the U. S., p. 213, Pl. CXLII, figs. 1 & 2,
1887.

De Toni, Syll. Alg., Vol. I, p. 747, 1889.

Zygnema commune Hassall, Brit. F. W. Algae, p. 148, Pl.
XXVIII, figs. 5 & 6, 1845.

Floating among other algae, North Reservoir, Winchester,
Massachusetts, Sept. 9, 1907.

F. S. COLLINS

Yale University Herbarium

YU.094457

Phycotheca Boreali-Americana.

1417. Spirogyra fluviatilis

Hilse.

Hilse in Rabenhorst, Algen, No. 1476.

Petit, Spirogyres des Environ de Paris, p. 27, Pl. V, fig. 13, 1880.

Wolle, F. W. Algae of the U. S., p. 216, Pl. CXXXVI, figs. 1-3,
1887.

De Toni, Syll. Alg., Vol. I, p. 762, 1889.

In floating mats with other plants, shore of a pond in Med-
ford, Massachusetts, Sept. 7, 1907.

F. S. COLLINS

With spores; the vegetative, attached form of this species
was distributed as P. B.-A., No. 1217.