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Wenham, Massachusetts.

Beufort, North Carolina.

On Gymnogongrus linearis (Turn.) J. Ag., San Pedro, California.

On Zostera marina, Salt Pond, Eastham, Massachusetts.

Among filamentous floating algae, Meeting House Pond, Eastham, Massachusetts.

Epiphytic on flowering plants in shallow water, Herring Pond, Eastham, Massachusetts.

Forming a red scum on a small pond in Middlesex Fells, Massachusetts.

Among aquatic plants in a pool in Middlesex Fells, Massachusetts.

On Batrachospermum vagum Ag., Lake Chocorua, new Hampshire.

With various other algae, in a pond, Eastham, Massachusetts.

In floating mats with other plants, shore of a pond in Medford, Massachusetts.

Loosely floating, in company with Anabaena flos-aquae (Lyng.) Bréb., and other algae, in a pond, Eastham, Massachusetts.

With Hyalotheca mucosa (Dillw.) Ehrenb. and other algae in a gelatinous coating on stems of Pontenderia cordata, Eastham, Massachusetts.

Among sterile Mougetia in pond, Manchester, Massachusetts.

Floating in Meeting House Pond, Eastham, Massachusetts.

Rather infrequent scattered filaments among various algae, Wright's Pond, Medford, Massachusetts.

On pebbles in 1-10 cm. water, Herring Pond, Eastham, Massachusetts.

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

In shallow pools, muddy shore of Pleasant Lake, Harwich, Massachusetts.

Floating in Jemima's Pond, Eastham, Massachusetts.

Among other algae, North Reservoir, Winchester, Massachusetts.

Among various algae, in a swamp in Middlesex Fells, Massachusetts.

In pools above low water mark, Land's End, San Francisco, California.

On Zostera, washed ashore, Harpswell, Maine.

On bladders of Egregia menziesii (Turn.) Aresch., Fort Point, San Francisco, California.

On Dictyota binghamiae J. Ag., La Jolla, California.

Appeared in a jar in the Maine Biological Laboratory, Wood's Hole, Massachusetts.

On Zostera, etc., Mattapoisett, Massachusetts.

Forming thin black continuous sheets on the mud of a salt marsh, Bay shore, Eastham, Massachusetts.

In dense masses on vertical rock wall, exposed to the full force of the waves, Eagle Island, Casco Bay, Maine.

Floating at low water mark, Sachuest Point, Newport, Rhode Island.

On decaying Zostera marina, Mattapoisett, Massachusetts.

On Cladophora, roadside pool, Berkeley, California.

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

Cultivated at the Botanical Laboratory of the University of California, Berkeley, California.

On Zostera in tide pool, Mettapoisett, Massachusetts.

in whitish masses on bottom of Lake Chocorua, New Hampshire.

Growing in a glass jar in the Botanical Laboratory of the University of California, Berkeley, California.

Floating in a pond, Presidio, San Francisco, California.

On Zostera, Mattapoisett, Massachusetts.

Floating in a spring, Mount Carmel, Connecticut.

On earth and rocks, Mavis Bank Road, Jamaica.

On Cladophora, in a roadside pool, Berkeley, California.

On logs of dam at outlet of Lake Chocorua, New Hampshire.

In a small stream, Mount Tamalpais, marin County, California.

Forming slightly pinkish loose tufts on subermerged rocks, outlet of Lake Chocorua, New Hampshire.

Floating on the surface of quiet water in a shaded creek running into Lake Temescal, Oakland, California.

On cement wall of a fountain, berkeley, California.

On Juncus species, in a small pond, North Berkeley, California.

In a small pool near Siasconset, Nantucket, Massachusetts.