Phycotheca Boreali-Americana. Collins, Holden, and Setchell.

542. Plocamium violaceum Farlow.

Farlow, Proc. Amer. Acad., Vol. XII, p. 240, 1877.

C. L. Anderson, Zoe, Vol. II, p. 224, 1891.

J. G. Agardh, Analecta Algologica, p. 91, 1892.

Howe, Erythea, Vol. I, p. 65, 1863.

McClatchie, Proc. Southern Calif. Acad., Vol. I, p. 388, 1897.

a. Forming patches on rocks between tide marks, Pacific Grove, California, Jan., 1898.

With tetraspores.

C. P. NOTT.

b. Land's End, San Francisco, California, Sept. 17, 1898.

Cystocarpic and tetrasporic plants in each specimen.

W. A. SETCHELL.

Q

YU.091625

P

YU.106520