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Sesacacha Pond, nantucket.

On upper surface of rocks at half tide, La Jolla, california.

Washed ashore, Portsmouth, Rhode Island.

Cast ashore from deep water, very sparingly, west coast of Whidbey Island, Washington.

Upper sublitoral zone, Whidbey Island, Washington.

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

On stipes of Lessonia at extreme low water mark, Minnesota Seaside Station, Vancouver Island.

On small stones, in a small muddy cove, east shore of Amaknak Island, Alaska.

Attached to rocks in lower litoral zone, west coast of Whidbey Island, Washington.

On stipes of Lessonia, Minnesota Seaside Station, Vancouver Island.

Attached to rocks, lower litoral zone, San Juan County, Washington.

On the Channel Rocks, near Bear's Point, Puget Sound, near Seattle, Washington.

Minesota Seaside Station, Vancouver Island.

Floating, San Juan Island, Washington.

Tide pool, upper litoral, Esquimault, British Columbia.

Attached to rocks in the upper litoral zone, Mats-Mats Bay, San Juan Island, Washington.

Similar locality to 919a: Attached to floating log, Lake Washingtin, Seattle, Washington.

Attached to rocks exposed to the waves, west coast of Whidbey Island, Washington.

On leaves of Nereocystis luetkeana, Cormorant Rock, Uyak Bay, Kadiak Island, Alaska.

Just below extreme low water mark, west coast of Whidbey Island, Washington.

Cast ashore from deep water from June to September in considerable quantities, and to some extent all the year round; west coast Whidbey Island, Washington.

Attached to a floating log, Lake Washington, Seattle, Washington.

On rocks in pools, middle litoral zone, Unalaska, Alaska.

Attached to stones, lower portion of litoral zone, west coast of Whidbey Island, Washington.

Very abundant on rocks in the lower litoral zone, East Sound, Orcas Island, Washington.

On stones, forming a distinct zone in the lower litoral, west coast of Amaknak island, Alaska.

On rocks in the lower portion of the litoral zone, Esquimault, British Columbia.

On stones in lower litoral zone, west coast of Whidbey Island, Washington.

On stones, muddy shore, middle litoral zone, Orca, Prince William Sound, Alaska.

On stones, middle litoral zone, west shore of Amaknak Island, Alaska.

Cast ashore very sparingly after heavy stoms, west coast of Whidbey Island, Washington.

On rocks, lower litoral zone, west shore of Amaknak Island, Alaska.

Cast ashore very sparingly after heavy storms, west coast of Whidbey Island, Washington.

Loosely attached to Fucus and other algae in shallow pools very nearly up to high water mark, west shore of Amaknak Island, Alaska.

On mussels and other algae, in shallow pools, upper litoral west shore of Amaknak Island, Alaska.

Plentiful on rocks, middle litoral zone, Kadiak Island, Alaska.

Attached to rocks along a very narrow belt at extreme low water mark, west coast of Whidbey Island, Washington.

Forming a light brown gelatinous scum on a small artificial pond, Pogy Oil Factory, Bristol, Maine.

On stems of plants in clay pit, Medford, Massachusetts.

Mixed with Nostoc sp., and Calothrix parietina, forming a thin layer on the side of a watering trough, Dillon's beach, entrance to Tomales Bay, Marin County, California.

In standing water by roadside, Pine Banks Park, Melrose, Massachusetts.

Forming an emerald green, rather thick coating on steaming rocks above the Devil's Kitchen, Geysers, Sonoma County, California.

In rock pools at Clifton, Massachusetts.

On rocks, more or less exposed to the force of the waves, in the lower litoral zone, Carmel Bay, Monterey County, California.

Coating moist limestone rocks, on shore of Housatonic River near Gaylordsville, Connecticut.

In moist places just above high water mark, Marblehead, Massachusetts.

Forming a black velvety covering on the bottoms of small pools in the rocks, above high water mark, but filled with salt water from the spray and higher waves, though often much concentrated by the sun. Near Point Carmel, Monterey County, California.

On stones in brook, Malden, Massachusetts.

In long, dark emerald-green penicillata tufts, waving in a stream of hot water, (Temperature 49-50 C.) Arrowhead Hot Springs, near San Bernadino, California.

On Chaetomorpha area, in company with Calothrix crustacea, in a pool, Pacific Beach, California.