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Brookings, South Dakota.

In roadside pool, Pine Banks Park, Melrose, Massachusetts.

Alameda Creek, California.

Fellsmere, Malden, Massachusetts.

On rocks between tides, Pacific Grove, California.

Forming minute light brown tufts on the conceptacles of Cystoseira osmundacea, often associated with E. cylindraceus. Pacific Grove, California.

Long Pond, Falmouth, Massachusetts.

On small submerged objects, in roadside pool, Pine Banks Park Melrose, Massachusetts.

In a little pool, about four meters above high water mark, Conanicut, Rhode Island.

Fellsmere, Malden, Massachusetts, in company with various other algae.

On Laminaria andersonii, Point Pinos, California.

On tips of Fucus evanescens, Pacific Grove, California.

On Pelvetia fastigiata, San Pedro, California.

On leaves of Desmarestia ligulata, Monterey California.

On damp ground, Middlesex Fells, Massachusetts.

Forming dark brown patches on damp soil in greenhouses, University of California, Berkeley, California.

On moist earth, near Spot Pond, Middlesex Fells, Massachusetts.

On ground in woods at the base of Mount Kineo.

In clear running spring water, Roberts County, South Dakota.

In artesian water, Iroquois, South Dakota.

In a ditch just above the beach, Eagle Island, Penobscot Bay, Maine.

On moist ground by Winchester Reservoir, Middlesex Fells, Massachusetts.

On stones, shore of Spot Pond, Middlesex Fells, Massachusetts.

Tortugas, Florida.

On rocks near low water mark, Pacific Grove, Monterey County, California.

On rocks in small pools, between tides, Carmel Bay, Monterey County, California.

On leaves of Phyllospadix growing on exposed shores, Fort Ross, Sonoma County, California.

Cast ashore from deep water upon the beaches about Pacific Grove, Monterey County, California.

On leaves of Phyllospadix growing on exposed shores, Carmel Bay, Monterey County, California.

Growing on Ruppia maritima, always in company with Ectocarpus subcorymbosus, in large salt marsh tide pool, Bridgeport, Connecticut.

On stones, at or just below extreme low water mark, where small tidal eddies are present; Monterey, Monterey County, California.

On various algae between tide marks, La Jolla, California.

On old wreck, Indian River Inlet, Florida.

On stones at low water mark, Dillon's Beach, Marin County, California.

In similar places [On stones at low water mark], Fort Point, San Francisco, California.

On various algae, at low water mark, Pacific Beach, San Diego County, California.

Harbor of Bridgeport, Connecticut.

Floating in Spot Pond Brook, near Fells Station, Melrose, Massachusetts.

Growing with Sphagnum in a shallow ditch of fresh water by the roadside, East Haven, Connecticut, with Microspora Willeana.

In fresh or possibly very slightly brackish water, Los Angeles, California.

On moist sandy soil, near clay pits, Medford, Massachusetts.

On sides of wooden horse trough, melrose, Massachusetts.

On rocks near high water mark, Pacific Beach, California.

Ash Creek (brackish), on bank overflowed at high water, Bridgeport, Connecticut.

In brackish water, South Dakota.

Forming bluish green gelatinous patches in shallow grassy parts of the western Weweeder Pond, Nantucket, Massachusetts.

Swamp in Malden, Massachusetts.

On side of stream, in quiet water, Bridgeport, Connecticut.

Roadside pool in Middlesex Fells, Massachusetts.

Growing to the length of half a meter or more, in a quiet stream, Bridgeport, Connecticut.