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On sandy rocks, in small tideways, lower litoral and upper sublotoral zones, Monterey, California.

On Enteromorpha intestinalis, in pool at high water mark, Easton's Point, Newport, Rhode Island.

Covering the surface of pebbles in a shallow pool, middle litoral zone, and exposed at high water to heavy seas. Collected in a single locality on the west coast of Whidbey Island, Washington.

Floating among Ruppia in a salt water pond, west coast of Whidbey Island, Washington.

Attached to rocks and stones in a cold mountain stream, Juneau, Alaska.

In pools, middle litoral zone, Unalaska, Alaska.

Floating in salt water, Coupeville, Washington.

On stones near low water mark, Sachuest Point, Newport, Rhode Island.

Resting on bottom in shallow water, Charles Island near Milford, Connecticut.

On Laurencia pinnatifida, growing between tide marks, Fort Ross, Sonoma County, California.

On Zostera, Charles Island near Milford, Connecticut.

Growing on old logs, in a small cove, Whidbey Island, Washington.

On moist bank near a bicycle path, Madrona Park, Seattle, Washington.

In shallow pools, middle litoral zone, west shore of Amaknak Island, Alaska.

On rocks in tide pools, litoral zone, Dillon's Beach, entrance to Tomales Bay, Marin County, California.

Growing on the mud in a salt marsh, Pen's Cove, Whidbey Island, Washington.

Growing on dripping rocks above high water mark, San Juan Island, Washington.

On rocks in lower part of litoral zone, Spectacle Island, Penobscot Bay, Maine.

On Zostera, at low water mark, Sachuest Point, Newport, Rhode Island.

Floating in salt water pond, west coast of Whidbey Island, Washington.

On Laurencia obtusa, Kingston Harbor, Jamaica.

The Gut. Bridgeport, Connecticut, on Zostera.

Floating in quantity, probably growing on Gracilaria confervoides, upper sublitoral zone, Monterey, California.

The Gut, Bridgeport, Connecticut, on Zostera.

On mud in a salt marsh, Snakalum Point, Whidbey Island, Washington.

Forming thick, reddish-brown to black, orbicular or decidedly irregular patches on rocks near high water mark, Land's End, San Francisco, California.

In tank in greenhouse, University of California, Berkeley, California.

In artesian well water, Iroquois, South Dakota.

On rocks at half tide, Cape Rosier, Maine.

Growing on decaying vegetation in a small pool, submerged about two feet, Whidbey Island, Washington.

Port Henderson, Jamaica.

Forming extensive, soft, gelatinous masses on stipes of Laminaria longicruris, Muscongus Bay, Maine.

Floating, but probably growing on Zostera latifolia, in the upper part of the sublitoral zone, Monterey, California.

On leaves of Zostera latifolia, in the sublitoral zone, but the specimens distributed were found floating. Monterey, California.

On stones in creek near Minnesota Seaside Station, Vancouver Island, British Columbia.

On margins and sparingly on surface of Rhodymenia palmata, at low water mark, Muscongus Bay, Bristol, Maine.

On stones in brook, Pine Banks Park, Melrose, Massachusetts.

On stones in cuvert under railway, Wakefield, Massachusetts.

Outlet of Ox Bow Lake, near Lake Piseco, Adirondacks Mountains, Hamilton County, New York.

Floating, but unusually found growing on other algae on the lowermost litoral and upper sublitoral zones, Moss Beach, near Pacific Grove, California.

On stones in stream, Malden, Massachusetts.

On the less exposed surfaces of rocks, uppermost litoral zone, Pyramid Point, near Pacific Grove, California.

Forming a coating on stones in swift water, Pequonnock River, near Trumbull, Connecticut.

On rocks between tides, West Coast of Whidbey Island, Washington.

On rocks and on Taonia Lennebackerae, in tide pool, middle of litoral zone, La Jolla, California.

On rocks, upper littoral zone, west shore of Amaknak Island, Bay of Unalaska, Alaska.

On Callymenia Phyllophora? washed ashore at Pacific Grove, California.

On Laurencia, washed ashore, Key West, Florida.

In a pond, Whidbey Island, Washington.

On piles, Old English Camp, San Juan Island, Washington.