Phycotheca Boreali-Americana.

Collins, Holden, and Setchell.

943. *Ceratothamnion Pikeanum* (Harv.) J. Ag. forma laxum Setchell and Gardner ms.

Forming spongy masses on the sides of vertical rocks, upper litoral zone, Harvester Island, Uyak Bay, Alaska. Aug. 21, 1899.

W. A. SETCHELL and A. A. LAWSON

This form differs from the type in having the branchlets less tightly interlaced into rope-like spongy masses on the branches.

W. A. S.

YU.092026