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Pout Pond, Uxbridge, Massachusetts.

In a pool in a field, Wakefield, Massachusetts.

Near Hammond's Pond, Newton, Massachusetts.

In Sphagnum, Pout Pond, Uxbridge, Massachusetts.

In squeezings of submerged Sphagnum, in small pond nearly dried up, Eastham, Massachusetts.

Reading, Massachusetts.

In small pond, near Bay Shore, Eastham, Massachusetts.

Brook in Middlesex Fells, Massachusetts.

Lake Quannapowitt, Reading, Massachusetts.

Floating in Lake Quannapowitt, Wakefield, Massachusetts.

On sand wet by spring water, Lake Merced, San Francisco, California.

Growing on stones, on Ruppia maritima, and on muddy bottom in a creek in Revere Marshes, near Linden Station, Mass.

On the undersides of overhanging rocks between tides, Nahant, Mass.

On stones and also epiphytic, in globose tufts, below low water mark - late winter and throughout the spring. Bridgeport, Conn.

In tide pools at Coddington Point, Newport, R.I.

On Zostera marina, Lynn Harbor, Mass.

On rocks in swift turbulent water; fronds beginning to form in late autumn and maturing in late spring or early summer. Island Brook, Bridgeport, Conn.

Revere Beach, Mass., abundant on Zostera marina growing near low water mark; Eudesme virescens, Punctaria latifola, and Monostroma grevillei often growing together with the Halothrix on the same leaf of Zostera.

In large tidepool, Spectacle Island, Penobscot Bay, Maine.

Great Falls of the Housatonic River, Conn.

On Zostera marina, usually in company with punctaria, below low water mark - not abundant in this locality, Bridgeport, Conn.

On Ulva, in tidepool, Spectacle Island, Penobscot Bay, Maine.

Cast ashore from deep water, Gay Head, Martha's Vineyard, Mass.

On stones below low water mark. Bridgeport, Conn.

Abundant on Ruppia maritima in the brackish water of Fresh Pond, and common, of less luxuriant growth, on Zostera along the shore of Long Island Sound; Stratford Conn.

Chiefly on stones near low water mark; sometimes epiphytic on Fucus, etc. Shore of Long Island Sound, Bridgeport, Conn.

Thrown up from deep water, and floating at Revere Beach, Mass.

Clothing fronds of Cladophora, Enteromorpha and other algae; also on rocks, Woodmont, Conn.

On leaves of Spartina, etc., between tides, Little Nahant, Mass.

Abundant on rocks between tide marks, Bridgeport, Conn.

Most abundant on stones just below low water mark; also epiphytic on other algae and Zostera. Bridgeport, Conn.

On smooth rocks exposed to the force of the waves at half and high water, resembling in its habitat and habit Bangia fusco-purpurea Lyngb., and growing with it. Little Nahant, Mass.

In wide patches between tides on rocks washed by the waves, Nahant, Mass.

In quiet, brackish water. The fronds sometimes a foot or more in width - at first attached, later floating, Stratford, Conn.

On Batrachospermum vagum Ag., Pleasantville, N.J.

Forming a close coating on stone work of dam, Pequonnock River, Bridgeport, Conn.

Abundant on stones in shallow water, Mill River, Fairfield, Conn.

Running brook, Melrose, Mass.

At first attached to sticks, stones, etc., later floating in still or running water. [Bridgeport, Conn.]

Attached to rocks in swift running water, Still River, near New Milford, Conn.

On rocks between tide marks, Mount Desert Island, Maine.

Forming fleecy masses in tidepools and on algae between tide marks, on exposed shore, Eagle Island, Penobscot Bay, Maine.

Forming tangled masses on rocks and gravel below low water mark, Bridgeport, Conn.

Attached to stones in swift water, Bridgeport, Conn.

Floating on quiet pool, Sangus, Mass.

On Polysiphonia fastigata (Roth) Grev., between tides, Little Nahant, Mass.

Resting on muddy bottom and floating in coniderable masses on the surface of quiet water, Parrot's Pond, Bridgeport, Conn.

Growing in tufts on perpendicular and overhanging cliffs, to which it is attached by the numerous rhizoidal branches, which are often of several cells; it agrees quite well with Harvey's plate, to which Rosenvinge refers, l.c. Eagle Island, Penobscot Bay,

In a brackish pool beside the Thames River, Norwich, Conn.

Growing in a rock pool reached by only the highest tides, Cape Rosier, Maine.