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In brackish water of clay pit, Medford, Massachusetts.

On firm bottom and on other algae in the litoral region, Bridgeport, Connecticut.

Growing to the length of half a meter to a meter, attached to stones in Pequonnock River, Bridgeport, Connecticut.

In streamlet, Bridgeport, Connecticut

On small mud-covered pebbles, below extreme low water mark, False Bay, San Diego, California.

On rocks exposed to the waves, Dillon's Beach, Marin County, California.

On exposed rocks, Pyramid Point, Monterey County, California.

Growing on stones at and just below extreme low water mark at Fort Point, San Francisco, California.

Lynn, Massachusetts.

Salt marshes of the Charles River, Cambridge, Massachusetts, growing very densely, forming a green velvet on marsh grass, etc., near the surface of the water.

On vertical face of moist limestone, Gaylordsville, Connecticut.

On flower pots, Botanic Garden, Cambridge, Massachusetts.

Forming a dense scum on Winchester Reservoir, Winchester, Massachusetts.

On Enteromorpha intestinalis, Easton's Point, Newport, Rhode Island.

On Calothrix crustacea Thuret, which forms a black velvet coating on smooth rocks, near high water mark, Carmel Bay, Monterey County, California.

On stones, shore of Spot Pond, Medford, Massachusetts.

In upper tide pools, on smooth rocks, Marblehead, Massachusetts.

Incrusted on limestone, shore of Housatonic River, near Gaylordsville, Connecticut.

On rocks, in littoral zone, Revere Beach, Massachusetts.

Floating and attached to the sides of a watering trough, supplied from an artesian well, near Hollister, California.

On walls of greenshouse, Botanic garden, Cambridge, Massachusetts.

On stones in streams near Pasadena, California.

In a clear lake fed by lime springs, Spring Hill, near Mobile, Alabama.

Forming more or less extended tufts on the cooler portions of the rocks from which the hot water drips at the Waterman Hot Springs, near San Bernadino, California.

On stones, wharves and Zostera, at one to two meters depth, Edgartown, Massachusetts.

Forming a reddish brown coating on wet cliffs, and especially in grottoes, Eagle Island, Penobscot Bay, Maine.

Forming gelatinous tubular coatings on old Spartina stems in ditches of a salt marsh, Bridgeport, Connecticut.

On Amphiroa Orbigiana at extreme low water mark, Point Pinos, Pacific Grove, Monterey County, California.

On rocks and boards, in old sluiceway, Still River, New Milford, Connecticut.

Forming gelatinous masses, attached to various plants, Munroe, Connecticut.

On woodwork of a dam, Centredale, Rhode Island.

Among Spartina, etc., on muddy bank between tide-marks, Eastham, Massachusetts.

In fresh water, Naushon Island, Massachusetts.

Marblehead, Massachusetts.

On rocks near high water mark, Nahant, Massachusetts

On rocks of jetties, at very low tide, Anastasia Island, Florida.

La Jolla & Pacific Beach, San Diego County, California.

On muddy turf of Spartina roots roots, near high water mark, Charles Island, near Milford, Conecticut.

On rocky shores in quiet water, at about half tide, Cape Rosier, Maine.

Beach, Pacific Grove, Monterey County, California.

Forming gelatinous films of a blood red color and wide extent, on sandy earth among flower-pots in plant houses. Bakersfield, California.

On rocks, well out, and exposed to the full force of the waves Dillon's Beach, Marin County, California.

University of California, Berkeley, California.

On rocks at low water mark, and just below, Pyramid Point, Monterey County, California.

Washed ashore, Jamestown, Rhode Island.

Scattered through a mass of Schizothrix etc., on wooden wall of tank, below or just above the water, greenhouse, Botanic Garden, Cambridge, Massachusetts.

On limestone slate rocks, banks of Piscataquis River, Dover, Maine.

Among Lyngbya aestuarii, etc., in rocky pool beside slate quarry, Sommerville, Massachusetts.

In sulphur iron water, Old Mission Dam, Santee, San Diego County, California.

Forming felty mats on sandy mud along Spartina near high water mark, occurring in late autumn and winter. Charles Island, near Milford, Connecticut.