YU.094171

Phycotheca Boreali-Americana.

Collins, Holden and Setchell.

1215. *Hyalotheca dissiliens* (Smith) Bréb.

For references see P. B.-A., No. 807.

Medford, Massachusetts, Oct., 1904.

F. D. LAMBERT.

In conjugation; the material distributed under No. 807 was vegetative.

YU.094172

Phycotheca Boreali-Americana.

Collins, Holden and Setchell.

1216. *Zygnema pectinatum* (Vauch.) Ag.

Agardh, Syst. Alg., p. 78, 1824.

De Toni, Syll. Alg., Vol. I, p. 736, 1889.

Conjugata pectinata Vaucher, Hist. des Conferves, p. 77, Pl. VII,
fig. 4, 1803.

Zygomonium pectinatum Wolle, F. W. Algae of the U. S., p. 225,
Pl. CXLV. figs. 1 & 2, 1887.

Lying loose on the bottom of Winchester North Reservoir,
Massachusetts, June 11, 1904.

F. S. COLLINS.