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Forming dense intricate masses in a water trough fed by a spring, North Berkeley, California.

Watch Hill Pond (brackish), Watch hill, Rhode Island.

Forming a zone, yellowish red just above, and blue green just below, the edge of the water, very low, in The Lagoon, Niles, Alameda Co., California.

Long Pond, near Lantern Hill, Ledyard, Connecticut.

On walls of greenhouse, Botanic Garden, Cambridge, Massachusetts.

In a pool near Wood's Hole, Massachusetts.

Walls of reservoir, Del Monte, Monterey Co., California.

Magnolia Point, Massachusetts.

San Francisco, California.

On the side of a water tank, Berkeley, california.

On moist claybank, Mounty Tamalpais, Marin County, California.

On moist ground, shore of Winchester lower reservoir, Winchester, Massachusetts.

Among sterile Oedogonium in artificial lily pond, Chocorua, New Hampshire.

On limestone rocks, Salisbury, Connecticut.

Floating on quiet water, Medford, Massachusetts.

On the sides of a water trough near Berkeley, California.

Forming a calcareous incrustation on perpendicular walls of a limestone quarry, Lincoln, Rhode Island.

On clay bank of a small stream, North Berkeley, California.

In older portion of Cystoclonium purpurascens (Huds.) Kuetz., Harpswell, Maine.

On rocks, middle and lower litoral, Land's End, San Francisco, California.

Forming a dense coating of short fronds, with abundant large receptacles, on a rock near high water mark, Rocky Point, Rhode Island.

Epiphytic on Amphiroa tuberculosa, along low water mark, Moss Beach, near Halfmoon Bay, San Mateo County, California.

Floating, Harpswell, Maine.

On Dasya elegans (Mart.) Ag., Wood's Hole, Massachusetts.

At half tide mark, Woodmont, Connecticut.

Floating in a pool in a salt marsh, Orcas Island, Washington.

On exposed rocks in litoral, Eagle Island, Casco Bay, Maine.

Parasitic on larger red algae, Fort Point, San Francisco, California.

On Dictyota Binghamiae J. Ag., San Diego, California.

Forming a blackish incrustation near the water line, in a stone drinking trough, Woburn, Massachusetts.

On ground moistened by salt water, Bay Farm Island, near Alameda, California.

In live shells of Littorina, in company with Hyella caespitosa Born. & Flah., Cape Rosier, Maine.

Floating in myriads in hot salt water, near Key Route power house, Oakland, California.

In company with O. limosa Ag. and O. tenuis Ag., in stagnant water, in claypit, West Medford, Massachusetts.

In a water trough, Campus, University of California, Berkeley, California.

Forming a thin layer on rocks, Stow Lake, Golden Gate Park, San Francisco, California.

In a marsh pool, Stover's Point, Harpswell, Maine.

Cultivated in the laboratory of Tufts College, from material collected in Back Bay Fens, Boston, Massachusetts.

Material originally from a fountain; cultivated in the Botanical Laboratory of the University of California, Berkeley, California.

Cultivated in the Laboratory of Tufts College Medical School, from Material collected in Back Bay Fens, Boston, Massachusetts.

Material, originally from a fountain, cultivated in the Botanical Laboratory of the University of California, Berkeley, California.

In mantle of Mytilus edulis, in tide pools, Harpswell, Maine.

Clay pit, Glenwood, Medford, Massachusetts.

In company with Selenastrum bibraianum Reinsch, Scenedesmus obliquus (Turp.) Kuetz., cultivated in the Laboratory of Tufts College, from material collected in Back Bay Fens, Boston, Massachusetts.

Floating in a small pond, North Berkeley, California.

In a ditch by the roadside, Malden, Massachusetts.

In stringy tufts, up to 40 cm. long, inlet og Birch Pond, Lynn, Massachusetts.

Floating in stagnant water, Melrose, Massachusetts.

Twin Lakes, Salisbury, Connecticut.

On rocks in 3 dm. water at low tide, San Juan, Porto Rico.