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On Gelidium, middle litoral, Point Carmel, Monterey County, California.

Bruce's Brook, Bridgeport, Connecticut, in company with O. tenuis, etc.

In long masses in quick running water, Inlet of Walden Pond, Lynnfield, Massachusetts.

On shells, Lake Chocorua, New Hampshire.

Lower Reservoir, Middlesex Fells, Massachusetts.

Stillman's Pond, Bridgeport, Connecticut.

Among other (sterile) Spirogyras, Brookfield, Connecticut.

In quite fresh water, old claypit, West Cambridge, Massachusetts.

Floating in a water trough, Berkeley, California.

In a pond, Wood's Hole, Massachusetts.

On leaves of trees, in company with other algae, Bath, Jamaica.

In an aquarium, Univ. of Washington, Seattle, Washington.

On dripping rocks, San Francisco, California.

In ditch by roadside by railroad, near Cliff House, San Francisco, California.

On Gymnogongrus linearis (Turn.) J. Ag., Land's End, San Francisco, California.

On rocks at low water mark, Bathsheba, Barbados.

Near low-water mark, with H. opuntia and H. scabra, Cæsar's creek, south of Elliott's Cay, Florida.

On and among corals and corallines, near low water mark, in a reef harbor, Culebra Island, Porto Rico.

In crevices and pockets of rock at low water mark, with A. rawsoni, Cockburn Harbor, South Caicos, Bahamas.

In 3-10 dm. of water, with A. nigricans, Mariguana, Bahamas.

On rocks near low-water mark, Abraham Bay, Mariguana, Bahamas.

On rocks from low-water mark to a depth of one meter, Atwood (Samana) Cay, Bahamas.

Common in 3-10 dm. of water, inside a reef, Castle Island, Bahamas.

On sand-covered rocks near low-water mark, growing with H. tridens and H. monile, Fort George Cay, Caicos Island.

Profusely abundant at a depth of 1-30 dm. in the Lake (salt water), Watling Island, Bahamas.

Lake Keuka, New York.

In 3-30 dm. of water in a creek, growing closely associated with H. tridens (P.B.-A., No. 1487), Watling Island, Bahamas.

On Desmarestia viridis (Fl. Dan.) Lamour., Robinson's Hole, Massachusetts.

Abundant in 3-6 dm. of water in a tidal creek, occasionally mixed with S. membranaceus (Ag.) Bornet, Cat Island, Bahamas.

Near low-water mark, Cockburn Harbor, South Caicos.

Rio Bono, Jamaica [= Rio Bueno].

St. Louis, Missouri.

In short dense tufts on Digenia simplex (Wulf.) Ag., Key West, Florida.

Forming films and strings on plants in Wright's Pond, Medford, Massachusetts.

In an aquarium, Physiological Laboratory of Tufts College Dental and Medical School, Boston, Massachusetts.

In company with A. catenula (Kuetz.) Born. & Flah. and other algae, Penny Brook, Lynn Woods, Massachusetts.

Forming light yellow expandions on sandy shore at low water mark, little Harbor, Wood's Hole, Massachusetts.

Minute colonies free among various algae in salt marsh pools, Harpswell, Maine.

On Cladophora expansa Kuetz., in marsh pools, Stover's Point, Harpswell, Maine.

Among various algae, Herring Pond, Eastham, Massachusetts.

Attached to flowering plants or floating, in a claypit, Glenwood, Medford, Massachusetts.

On Fontinalis in a pond, Cuttyhunk Island, Gosnold, Massachusetts.

On Oedogonium filaments, Wright's Pond, Medford, Massachusetts.

In shallow water, margin of Portage Lake, near Jackson, Michigan.

Lake Ontario, Oswego, New York.

In shallow water near Tlanlpam, Valley of Mexico.

Niagara Falls, New York.

Lake Michigan, near Chicago, Illinois.

Near Blocksberg, Humboldt County, California.

In one to two meters depth, Lake Quannapowitt, Wakefield, Massachusetts.