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On moist soil on a hillside, Marin County, California.

With Nostoc sp., on rocks, Chebacco Lake, Essex, Massachusetts.

Floating in great masses in a pond, Golden Gate Park, San Francisco, California.

Among other algae in a small pond, Eastham, Massachusetts.

Among Stigeoclonium stagnatile (Hazen) Collins, in a roadside pool, Middlesex Fells, Massachusetts.

In a small pond, Sacramento St., Massachusetts.

On a cliff wet with dripping water, east of Oakland, California.

Tile factory pond, Charleston, Illinois.

In an aquarium, Tufts College, Massachusetts.

On Amphiroa tuberculosa forma californica (Decne.) S.& G., Dillon's Beach, Marin County, California.

Dredged in 20-30 meters depth, below Canoe Island, San Juan County, Washington.

On boards in a propagating house, University of California, Berkeley, California.

In company with T. lanata Wartmann, forming a coating on a wooden chute, Icehouse Pond, Eastham, Massachusetts.

On old Zygnema etc., Charleston, Illinois.

On stalks of Juncus, Meeting House Pond, Eastham, Massachusetts.

On Nereocystis Luetkeana (Mert.) P.& R., Moss Beach, San Mateo County, California.

On stalks of Juncus, pond in Brewster, Massachusetts.

Growing in small pools in the granite blocks of the goverment breakwater, San Pedro, California.

On Nereocystis Luetkeana (Mert.) P. & R., Dillon's Beach, Marin County, California.

forming irregular green gelatinnous masses on a dripping water pipe, campus, University of California, Berkeley, California.

On submerged stones in fresh water, French watering place, Naushon Island, Massachusetts.

In an aquarium, University of California, Berkeley, California.

In tangled masses on various species of algae, Moss Beach, San Mateo County, California.

Floating in slightly brackish water, Berkeley, California.

In a swamp, Wakefield, Massachusetts, Among various filamentous algae.

In a small pond, Eastham, Massachusetts. in company with various algae.

In a floating mass of various algae, in a small pond nearly dried up, Eastham, Massachusetts.

In a small pond in Middlesex, Massachusetts. In company with Oe. pseudo-Boscii Hirn, Spirogyra protecta Wood, etc.

With other algae in green slimy coating on stalks of plants, in pound near Bay shore, Eastham, Massachusetts.

Lower Pond, Wakefield, Massachusetts.

In a small pond, Eastham, Massachusetts, among other algae, including Oe. decipiens Wittr., and Oe. platygynum Wittr., both considerably smaller species with operculate oogonia.

With other algae in a green slimy coating in the stalks of plants, pound near Bay Shore Eastham, Massachusetts.

Arlington, Massachusetts.

In a pond, Arlington, Massachusetts, in company with B. insignis. Prings.

Among other algae, in a pond near Bay Shore, Eastham, Massachusetts.

Among other algae, on Myriophyllum etc. Eastham, Massachusetts.

On Oedogonium sexenaulare Cleve, Lower Pond, Wakefield, Massachusetts.

Among various algae, floating in a small, nearly dried up pond, Eastham, Massachusetts.

With other filamentous algae, forming a scum on Great Pond, Eastham, Massachusetts.

In a small pond, Middlesex Fells, Massachusetts.

Floating in Lower Pond, Wakefield, Massachusetts.

In a pond, Eastham, Massachusetts.

Forming a dense coating on shells, in company with Calothrix crustacea Thuret, Ralfsia clavata (Carm.) Farlow; Salt Pond, Eastham, Massachusetts.

On stones at mount of a culvert, Wakefield, Massachusetts.

In a ditch near Hill's Crossing Station, Massachusetts.

In a ditch, Herring River Valley, Massachusetts.

In squeezings of moss from Flag Pond, Eastham, Massachusetts.

Forming a thin glossy coating on wall of a spring at high water mark, shore of Salt Pond, Eastham, Massachusetts.

In a ditch, Herring River Valley, Welfleet, Massachusetts.

Among Conferva etc., in a swamp, Wakefield, Massachusetts.